A method for optimal image subtraction

Abstract

We present a new method designed for optimal subtraction of two images with different seeing. Using image subtraction appears to be essential for the full analysis of the microlensing survey images, however a perfect subtraction of two images is not easy as it requires the derivation of an extremely accurate convolution kernel. Some empirical attempts to find the kernel have used the Fourier transform of bright stars, but solving the statistical problem of finding the best kernel solution has never really been tackled. We demonstrate that it is possible to derive an optimal kernel solution from a simple least square analysis using all the pixels of both images, and also show that it is possible to fit the differential background variation at the same time. We also show that PSF variations can also be easily handled by the method. To demonstrate the practical efficiency of the method, we analyzed some images from a Galactic Bulge field monitored by the OGLE II project. We find that the residuals in the subtracted images are very close to the photon noise expectations. We also present some light curves of variable stars, and show that, despite high crowding levels, we get an error distribution close to that expected from photon noise alone. We thus demonstrate that nearly optimal differential photometry can be achieved even in very crowded fields. We suggest that this algorithm might be particularly important for microlensing surveys, where the photometric accuracy and completeness levels could be very significantly improved by using this method.

8,pages, 4 Postscript figures, emulateapj.sty included

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• Census of Self-Obscured Massive Stars in Nearby Galaxies with Spitzer: Implications for Understanding the Progenitors of SN 2008S-Like Transients
• Five New Transit Epochs of the Exoplanet OGLE-TR-111b
• Image-Subtraction Photometry of the Globular Cluster M3: identification of new double-mode RR Lyrae stars
• Variability-selected quasars behind the Small Magellanic Cloud
• The OGLE Collection of Variable Stars. Nearly 66,000 Mira stars in the Milky Way
• Systematic KMTNet Planetary Anomaly Search. IV. Complete Sample of 2019 Prime-Field
• The transiting planet OGLE-TR-132b revisited with new spectroscopy and deconvolution photometry
• Discovery of Two Supernovae in the Nuclear Regions of the Luminous Infrared Galaxy IC 883
• Spitzer Microlens Measurement of a Massive Remnant in a Well-Separated Binary
• A faint optical flash in dust-obscured GRB 080603A - implications for GRB prompt emission mechanisms
• M31 pixel lensing event OAB-N2: a study of the lens proper motion
• The unpopular Package: a Data-driven Approach to De-trend TESS Full Frame Image Light Curves
• KMT-2017-BLG-2820 and the Nature of the Free-Floating Planet Population
• Variable H$\alpha$ Emission in the Nebular Spectra of the Low-Luminosity Type Ia SN2018cqj/ATLAS18qtd
• Planets in Stellar Clusters Extensive Search. IV. A detection of a possible transiting planet candidate in the open cluster NGC 2158
• A Trio of GRB-SNe: GRB 120729A, GRB 130215A / SN 2013ez and GRB 130831A / SN 2013fu
• Dwarf AGNs from Optical Variability for the Origins of Seeds (DAVOS): Insights from the Dark Energy Survey Deep Fields
• The ASAS-SN Catalog of Variable Stars VII: Contact Binaries are Different Above and Below the Kraft Break
• Digital Tracking Observations Can Discover Asteroids Ten Times Fainter than Conventional Searches
• Resolving Microlens Blends Using Image Subtraction
• Variability-based AGN selection using image subtraction in the SDSS and LSST era
• The Gravity Collective: A Search for the Electromagnetic Counterpart to the Neutron Star-Black Hole Merger GW190814
• Lupus-TR-3b: A Low-Mass Transiting Hot Jupiter in the Galactic Plane?
• RATS-Kepler -- a deep high cadence survey of the Kepler field
• The `666' collaboration on OGLE transits: I. Accurate radius of the planets OGLE-TR-10b and OGLE-TR-56b with VLT deconvolution photometry
• Transient-optimised real-bogus classification with Bayesian Convolutional Neural Networks -- sifting the GOTO candidate stream
• Pan-Planets: Searching for hot Jupiters around cool dwarfs
• Variable Stars in the Globular Cluster M5. Application of the Image Subtraction Method
• On the nature of the short duration GRB 050906
• LOSS's First Supernova? New Limits on the "Impostor" SN 1997bs
• Possible Solution of the long-standing discrepancy in the Microlensing Optical Depth Toward the Galactic Bulge by correcting the stellar number count
• OGLE-2015-BLG-1482L: the first isolated low-mass microlens in the Galactic bulge
• Hubble Space Telescope Observations of Novae in M49
• GRB 140606B / iPTF14bfu: Detection of shock-breakout emission from a cosmological gamma-ray burst?
• Microlensing events indicate that super-Earth exoplanets are common in Jupiter-like orbits
• KMT-2017-BLG-0165Lb: A Super-Neptune mass planet Orbiting a Sun-like Host Star
• KELT-25b and KELT-26b: A Hot Jupiter and a Substellar Companion Transiting Young A-stars Observed by TESS
• OGLE-2016-BLG-0613LABb: A Microlensing Planet in a Binary System
• CCD time-series photometry of the globular cluster NGC 5053: RR Lyrae, Blue Stragglers and SX Phoenicis stars revisited
• Do the photometric colors of Type II-P Supernovae allow accurate determination of host galaxy extinction?
• Systematic KMTNet Planetary Anomaly Search. VI. Complete Sample of 2018 Sub-Prime-Field Planets
• High-Cadence, Early-Time Observations of Core-Collapse Supernovae From the TESS Prime Mission
• Image-Subtraction Photometry of Variable Stars in the Globular Clusters NGC 6388 and NGC 6441
• High-redshift supernova rates measured with the gravitational telescope A1689
• MARVELS-1b: A Short-Period, Brown Dwarf Desert Candidate from the SDSS-III MARVELS Planet Search
• Planetary nebulae and stellar kinematics in the flattened elliptical galaxy NGC 1344
• SNIa-Cosmology Analysis Results from Simulated LSST Images: from Difference Imaging to Constraints on Dark Energy
• The eclipsing massive X-ray binary M33 X-7: New X-ray observations and optical identification
• Core-collapse supernovae in low-metallicity environments and future all-sky transient surveys
• Limb-darkening measurements for a cool red giant in microlensing event OGLE 2004-BLG-482
• The Dark Energy Survey: Cosmology Results With ~1500 New High-redshift Type Ia Supernovae Using The Full 5-year Dataset
• Millimagnitude Photometry for Transiting Extrasolar Planetary Candidates: II. Transits of OGLE-TR-113-b in the Optical and Near-IR
• Multicolour CCD photometry of the variable stars in globular cluster M3
• Gravitational Microlensing I: A Unique Astrophysical Tool
• OGLE-2011-BLG-0265Lb: a Jovian Microlensing Planet Orbiting an M Dwarf
• Characterizing Low-Mass Binaries From Observation of Long Time-scale Caustic-crossing Gravitational Microlensing Events
• Hello Darkness My Old Friend: The Fading of the Nearby TDE ASASSN-14ae
• OGLE-2016-BLG-1190Lb: First Spitzer Bulge Planet Lies Near the Planet/Brown-Dwarf Boundary
• Image-Subtraction Photometry of Variable Stars in the Field of the Globular Cluster NGC 6934
• Long-term photometry and periods for 261 nearby pulsating M giants
• The Angstrom Project: a microlensing survey of the structure and composition of the bulge of the Andromeda galaxy
• The ASAS-SN Catalog of Variable Stars IV: Periodic Variables in the APOGEE Survey
• Optical follow-up of the tidal disruption event iPTF16fnl: new insights from X-shooter observations
• OGLE-2017-BLG-0173Lb: Low Mass-Ratio Planet in a "Hollywood" Microlensing Event
• The Globular Cluster M15. I. Identification, Discovery, and Period Determination of Variable Stars
• The OGLE View of Microlensing towards the Magellanic Clouds. II. OGLE-II SMC data
• Search for precursor eruptions among Type IIb supernovae
• The Rapid X-ray and UV Evolution of ASASSN-14ko
• Evidence of Halo Microlensing in M31
• Variable stars in the Fornax dSph Galaxy. I. The Globular Cluster Fornax 4
• First Earth-based Detection of a Superbolide on Jupiter
• A free-floating or wide-orbit planet in the microlensing event OGLE-2019-BLG-0551
• First results from GeMS/GSAOI for project SUNBIRD: Supernovae UNmasked By Infra-Red Detection
• The IR counterpart of the black-hole candidate 4U 1630-47
• The first direct detection of a gravitational micro-lens toward the Galactic bulge
• A Southern Sky and Galactic Plane Survey for Bright Kuiper Belt Objects
• DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries and Cepheids. VII. Additional Variables in the Field M33A Discovered with Image Subtraction
• The OmegaWhite Survey for Short-Period Variable Stars I: Overview and First Results
• The Transit Light Curve Project. IV. Five Transits of the Exoplanet OGLE-TR-10b
• Detection of period variations in extrasolar transiting planet OGLE-TR-111b
• A new search for planet transits in NGC 6791
• The Clusters AgeS Experiment (CASE). II. The Eclipsing Blue Straggler OGLEGC-228 in the Globular Cluster 47 Tuc
• OGLE-2018-BLG-1011L\lowercase{b,c}: Microlensing Planetary System with Two Giant Planets Orbiting a Low-mass Star
• The Core-Collapse Supernova Rate in Arp299 Revisited
• Characterizing Lenses and Lensed Stars of High-Magnification Single-lens Gravitational Microlensing Events With Lenses Passing Over Source Stars
• Observational determination of the time delays in gravitational lens system Q2237+030
• Astronomical Image Subtraction by Cross-Convolution
• Parallax Microlensing Events in the OGLE II Database Toward the Galactic Bulge
• $Spitzer$ Microlensing Parallax for OGLE-2017-BLG-0896 Reveals a Counter-Rotating Low-Mass Brown Dwarf
• Pushing the Limits of Ground-Based Photometric Precision -- Sub-Millimagnitude Time-Series Photometry of the Open Cluster NGC 6791
• KMT-2019-BLG-2073: Fourth Free-Floating-Planet Candidate with $θ_\rm E < 10 \rmμas$
• A NICMOS search for obscured Supernovae in starburst galaxies
• Kojima-1Lb Is a Mildly Cold Neptune around the Brightest Microlensing Host Star
• Limits on planetary-mass primordial black holes from the OGLE high-cadence survey of the Magellanic Clouds
• Machine-learning Selection of Optical Transients in Subaru/Hyper Suprime-Cam Survey
• OGLE-2018-BLG-1700L: Microlensing Planet in Binary Stellar System
• The Hyper Suprime-Cam SSP Transient Survey in COSMOS: Overview
• Can the masses of isolated planetary-mass gravitational lenses be measured by terrestrial parallax?
• A Short, Non-Planetary, Microlensing Anomaly: Observations and Lightcurve Analysis of MACHO 99-BLG-47
• The Rate of Type Ia Supernovae at z~0.2 from SDSS-I Overlapping Fields
• The nature of supernovae 2010O and 2010P in Arp 299 - I. Near-infrared and optical evolution
• A Low-Mass Black Hole in the Nearby Seyfert Galaxy UGC 06728
• V409 Tau As Another AA Tau: Photometric Observations of Stellar Occultations by the Circumstellar Disk
• Microlens Parallaxes with SIRTF
• A Method for the Detection of Planetary Transits in Large Time-Series Datasets
• The Subaru/XMM-Newton Deep Survey (SXDS) - V. Optically Faint Variable Object Survey
• Low Metallicity Indicates that the Hypervelocity Star HE 0437-5439 was Ejected from the LMC
• A multi-wavelength analysis of a collection of short-duration GRBs observed between 2012-2015
• Detached binaries in the Large Magellanic Cloud. A selection of binaries suitable for distance determination
• Chandra, HST/STIS, NICER, Swift, and TESS Detail the Flare Evolution of the Repeating Nuclear Transient ASASSN-14ko
• Properties of M31. II: A Cepheid disk sample derived from the first year of PS1 PAndromeda data
• Systematic KMTNet Planetary Anomaly Search, Paper VII: Complete Sample of $q<10^{-4}$ Planets from the First Four-Year Survey
• An Extreme Amplitude, Massive Heartbeat System in the LMC Characterized Using ASAS-SN and TESS
• A Super-Jupiter orbiting a late-type star: A refined analysis of microlensing event OGLE-2012-BLG-0406
• GRB 050911: a black hole - neutron star merger or a naked GRB
• Periodic variable stars in CoRoT field LRa02 observed with BEST II
• Identification of twenty-three accreting binaries in the Galactic Bulge Survey
• Microlensing in the double quasar SBS1520+530
• OGLE-2015-BLG-1459L: The Challenges of Exo-Moon Microlensing
• The luminous host galaxy, faint supernova and rapid afterglow rebrightening of GRB 100418A
• Identifying the Location in the Host Galaxy of the Short GRB 111117A with the Chandra Sub-arcsecond Position
• A Case for a Binary Black Hole System Revealed via Quasi-Periodic Outflows
• Microlensing optical depth and event rate in the OGLE-IV Galactic plane fields
• The influence of binarity on dust obscuration events in the planetary nebula M 2-29 and its analogues
• Extracting Microlensing Signals from K2 Campaign 9
• Reverberation Mapping of IC4329A
• The Wendelstein Calar Alto Pixellensing Project (WeCAPP): The M31 Variable Star Catalogue
• Optical/$\gamma$-ray blazar flare correlations: understanding the high-energy emission process using ASAS-SN and Fermi light curves
• Searching for variable stars in the cores of five metal rich globular clusters using EMCCD observations
• Optical Variability of the Dwarf AGN NGC 4395 from the Transiting Exoplanet Survey Satellite
• Photometric and polarimetric observations of fast declining Type II supernovae 2013hj and 2014G
• DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries and Cepheids. VIII. Additional Variables in the Field M33B Discovered with Image Subtraction
• Study of variable stars in the MOA data base: long-period red variables in the Large Magellanic Cloud
• Gravitational Binary-lens Events with Prominent Effects of Lens Orbital Motion
• Light curves of five type Ia supernovae at intermediate redshift
• CXOGBS~J173620.2--293338: A Candidate Symbiotic X-ray Binary Associated with a Bulge Carbon Star
• Planetary nebulae in the elliptical galaxy NGC 4649 (M 60): kinematics and distance redetermination
• Using Host Galaxy Photometric Redshifts to Improve Cosmological Constraints with Type Ia Supernova in the LSST Era
• SN2007ax : An Extremely Faint Type Ia Supernova
• Spatial distributions of core-collapse supernovae in infrared-bright galaxies
• The Lupus Transit Survey For Hot Jupiters: Results and Lessons
• ASASSN-15hy: an under-luminous, red 03fg-like type Ia supernova
• Discovery of > 200 RR Lyrae Variables in M62: An Oosterhoff I Globular Cluster with a Predominantly Blue HB
• Swift captures the spectrally evolving prompt emission of GRB 070616
• Recurrent and symbiotic novae in the OGLE data
• Transit Search from Antarctica and Chile - Comparison and Combination
• An Isolated Microlens Observed from K2, Spitzer and Earth
• A Mid-infrared Study of Superluminous Supernovae
• A Joint Roman Space Telescope and Rubin Observatory Synthetic Wide-Field Imaging Survey
• Supernova 2013fc in a circumnuclear ring of a luminous infrared galaxy: the big brother of SN 1998S
• Type Ia supernova Hubble diagram with near-infrared and optical observations
• Identification of 5 Interacting Binaries in the Galactic Bulge Survey
• Radio sources in the Chandra Galactic Bulge survey
• The unusually large population of Blazhko variables in the globular cluster NGC 5024 (M53)
• Color Effects Associated with the 1999 Microlensing Brightness Peaks in Gravitationally Lensed Quasar Q2237+0305
• High-Precision Photometry of the Gamma-Ray Burst 020813: The Smoothest Afterglow Yet
• ASASSN-15pz: Revealing Significant Photometric Diversity among 2009dc-like, Peculiar SNe Ia
• Subaru weak-lensing measurement of a z = 0.81 cluster discovered by the Atacama Cosmology Telescope Survey
• Time Series Photometry of Variable Stars in the Globular Cluster NGC 6397
• The Longest Delay: a 14.5 Yr Campaign to Determine the Third Time Delay in the Lensing Cluster SDSS~J1004+4112
• Study of Globular Cluster M53: new variables, distance, metallicity
• SN 2005at - A neglected type Ic supernova at 10 Mpc
• A search for transiting extrasolar planet candidates in the OGLE-II microlens database of the galactic plane
• Discovery of four X-ray quasars behind the Large Magellanic Cloud
• The possibility of detecting planets in the Andromeda Galaxy
• 2011 HM102: Discovery of a High-Inclination L5 Neptune Trojan in the Search for a post-Pluto New Horizons Target
• The Cepheid distance to the maser-host galaxy NGC 4258: Studying systematics with the Large Binocular Telescope
• OGLE-2008-BLG-510: first automated real-time detection of a weak microlensing anomaly - brown dwarf or stellar binary?
• SN2019yvq Does Not Conform to SN Ia Explosion Models
• Systematic KMTNet Planetary Anomaly Search, Paper III: One Wide-Orbit Planet And Two Stellar Binaries
• Spitzer Observations of OGLE-2015-BLG-1212 Reveal a New Path to Breaking Strong Microlens Degeneracies
• Variable stars in the dwarf irregular galaxy NGC 6822: the photometric catalogue
• First microlensing candidate towards M31 from the Nainital Microlensing Survey
• OGLE-2015-BLG-0479LA,B: Binary Gravitational Microlens Characterized by Simultaneous Ground-based and Space-based Observation
• Occultation Portal: a web-based platform for data collection and analysis of stellar occultations
• Discovery of a Low-Mass Companion to a Metal-Rich F Star with the MARVELS Pilot Project
• Cepheids in M31 - The PAndromeda Cepheid sample
• Supernovae and radio transients in M 82
• Optical continuum photometric reverberation mapping of the Seyfert-1 galaxy Mrk509
• Light Echoes of Transients and Variables in the Local Universe
• Long-term variability survey of the old open cluster NGC 6791
• Radio monitoring of NGC 7469: Late time radio evolution of SN 2000ft and the circumnuclear starburst in NGC 7469
• Mass Production of 2021 KMTNet Microlensing Planets I
• Discovery of Variability of the Progenitor of SN 2011dh in M51 Using the Large Binocular Telescope
• Systematic KMTNet Planetary Anomaly Search. VIII. Complete Sample of 2019 Subprime Field Planets
• Robotic Reverberation Mapping of the Southern Seyfert NGC 3783
• Bias-Free Shear Estimation using Artificial Neural Networks
• A Search for Optical Variability of Type 2 Quasars in SDSS Stripe 82
• A dearth of planetary transits in the direction of NGC 6940
• Confirmed short periodic variability of subparsec supermassive binary black hole candidate Mrk 231
• Characterization of CoRoT target fields with BEST: Identification of periodic variable stars in the IR01 field
• CCD Photometry of the globular cluster M2. RR Lyrae physical parameters and new variables
• The Clusters AgeS Experiment (CASE). I. V209 omega Cen - An Eclipsing Post-Common Envelope Binary in the Globular Cluster omega Cen
• Extreme variability in an active galactic nucleus: Gaia16aax
• The Loudest Stellar Heartbeat: Characterizing the most extreme amplitude heartbeat star system
• The optical counterpart of IGR J00291+5934 in quiescence
• The evolution stage and massive disc of the interacting binary V393 Scorpii
• CKVul: evolving nebula and three curious background stars
• The NN2 Flux Difference Method for Constructing Variable Object Light Curves
• SN 2017ivv: two years of evolution of a transitional Type II supernova
• Multiwavelength properties of Miras
• Machine Learning on Difference Image Analysis: A comparison of methods for transient detection
• Supersoft X-rays reveal a classical nova in the M 31 globular cluster Bol 126
• MOA-2016-BLG-319Lb: Microlensing Planet Subject to Rare Minor-Image Perturbation Degeneracy in Determining Planet Parameter
• M75, a Globular Cluster with a Trimodal Horizontal Branch. II. BV Photometry of the RR Lyrae Variables
• MOA-2015-BLG-337: A Planetary System with a Low-mass Brown Dwarf/Planetary Boundary Host, or a Brown Dwarf Binary
• Observations of the M82 SN 2014J with the Kilodegree Extremely Little Telescope
• Cool, Luminous, and Highly Variable Stars in the Magellanic Clouds from ASAS-SN: Implications for Thorne-Żytkow Objects and Super-Asymptotic Giant Branch Stars
• Variability-selected QSO candidates in OGLE-II Galactic Bulge fields
• Using the 1.6um Bump to Study Rest-frame NIR Selected Galaxies at Redshift 2
• LSQ13ddu: A rapidly-evolving stripped-envelope supernova with early circumstellar interaction signatures
• OGLE-2015-BLG-1771Lb: A Microlens Planet Orbiting an Ultracool Dwarf?
• Discovery of a Variable Star Population in NGC 2808
• Regularization Techniques for PSF-Matching Kernels. I. Choice of Kernel Basis
• Measurement of Source Star Colors with the K2C9-CFHT Multi-color Microlensing Survey
• Monitoring the temperature and reverberation delay of the circumnuclear hot dust in NGC 4151
• Microlensig Binaries with Candidate Brown Dwarf Companions
• Mesolensing Explorations of Nearby Masses: From Planets to Black Holes
• KMT-2021-BLG-0171Lb and KMT-2021-BLG-1689Lb: Two Microlensing Planets in the KMTNet High-cadence Fields with Followup Observations
• Variable Stars in the Fornax dSph Galaxy. III. The Globular Cluster Fornax 5
• The ASAS-SN Catalog of Variable Stars VIII: "Dipper" Stars in the Lupus Star-Forming Region
• MOA-2008-BLG-379Lb: A Massive Planet from a High Magnification Event with a Faint Source
• A Plague of Magnetic Spots Among the Hot Stars of Globular Clusters
• The late-time afterglow evolution of long gamma-ray bursts GRB 160625B and GRB 160509A
• Subaru Hyper Suprime-Cam Survey for An Optical Counterpart of GW170817
• Classical Novae Masquerading as Dwarf Novae? Outburst Properties of Cataclysmic Variables with ASAS-SN
• The outer-halo globular cluster NGC 6229. IV. Variable stars
• Multi-resolution filtering: an empirical method for isolating faint, extended emission in Dragonfly data and other low resolution images
• CCD Photometry of the globular cluster NGC 5466. RR Lyrae light curve decomposition and the distance scale
• Difference Image Analysis of Defocused Observations with CSTAR
• Photometric study of the variable star population in the globular cluster NGC 6397
• Near-IR search for lensed supernovae behind galaxy clusters: I. Observations and transient detection efficiency
• Minute-cadence Observations of the LAMOST Fields with the TMTS: I. Methodology of Detecting Short-period Variables and Results from the first-year Survey
• High Amplitude δ-Scutis in the Large Magellanic Cloud
• Planetary nebulae in the elliptical galaxy NGC 821: kinematics and distance determination
• A 2.15 Hour Orbital Period for the Low Mass X-Ray Binary XB 1832-330 in the Globular Cluster NGC 6652
• Image deconvolution and PSF reconstruction with STARRED: a wavelet-based two-channel method optimized for light-curve extraction
• Exploring the Role of Globular Cluster Specific Frequency on the Nova Rates in Three Virgo Elliptical Galaxies
• Spectroscopic Mass and Host-star Metallicity Measurements for Newly Discovered Microlensing Planet OGLE-2018-BLG-0740Lb
• Clusters AgeS Experiment. Hot subdwarfs and luminous white dwarf candidates in the field of the globular cluster M4
• MOA-2013-BLG-220Lb: Massive Planetary Companion to Galactic-Disk Host
• GW150914: First search for the electromagnetic counterpart of a gravitational-wave event by the TOROS collaboration
• New Insights into Time Series Analysis II -- No Correlated Observations
• $12660$ spotted stars toward the OGLE Galactic bulge fields
• New Insights into Time Series Analysis - I - Correlated observations
• Characterization of CoRoT Target Fields with the Berlin Exoplanet Search Telescope: Identification of Periodic Variable Stars in the LRa1 Field
• On the Progenitor of the Type Ic Supernova 2012fh
• Investigating light curve modulation via kernel smoothing. II. New additional modes in single-mode OGLE classical Cepheids
• Photometry and Spectroscopy of the Optical Companion to the Pulsar PSR J1740-5340 in the Globular Cluster NGC 6397
• SN 2008gz - most likely a normal type IIP event
• Difference image analysis: The interplay between the photometric scale factor and systematic photometric errors
• Stellar variability on time-scales of minutes: results from the first 5 years of the Rapid Temporal Survey (RATS)
• Short-Period Variable Stars in the M31 Halo
• The Curious Case of PHL 293B: A Long-Lived Transient in a Metal-Poor Blue Compact Dwarf Galaxy
• The Subaru/XMM-Newton Deep Survey (SXDS) - VI. Properties of Active Galactic Nuclei Selected by Optical Variability
• Statistical Searches for Microlensing Events in Large, Non-Uniformly Sampled Time-Domain Surveys: A Test Using Palomar Transient Factory Data
• Candidate Gravitational Microlensing Events for Future Direct Lens Imaging
• On the Rotation Period of (90377) Sedna
• A dwarf nova in the globular cluster M13
• The Late Time Optical Evolution of Twelve Core-Collapse Supernovae: Detection of Normal Stellar Winds
• Hourly Variability in Q0957+561
• The Type Ia supernovae rate with Subaru/XMM-Newton Deep Survey
• The Nature of the Variable Galactic Center Source IRS16SW
• The Highly Luminous Type Ibn Supernova ASASSN-14ms
• The OmegaWhite Survey for Short-Period Variable Stars VII: High amplitude, short period blue variables
• Binary Source Microlensing Event OGLE-2016-BLG-0733: Interpretation of A Long-term Asymmetric Perturbation
• Photometric Analysis of the OGLE Heartbeat Stars
• OGLE-2017-BLG-0406: $Spitzer$ Microlens Parallax Reveals Saturn-mass Planet orbiting M-dwarf Host in the Inner Galactic Disk
• Microlens Parallax Asymmetries Toward the LMC
• e-MERLIN and VLBI observations of the luminous infrared galaxy IC883: a nuclear starburst and an AGN candidate revealed
• SN 2016gsd: An unusually luminous and linear type II supernova with high velocities
• CXOGBSJ174444.7-260330: a new long orbital period cataclysmic variable in a low state
• Planetary Transits Toward the Galactic Bulge
• KMT-2021-BLG-1077L: The fifth confirmed multiplanetary system detected by microlensing
• EMCCD photometry reveals two new variable stars in the crowded central region of the globular cluster NGC 6981
• MECI: A Method for Eclipsing Component Identification
• Three microlensing planets with no caustic-crossing features
• Chromaticity of Gravitational Microlensing Events
• $V$-band photometry of asteroids from ASAS-SN: Finding asteroids with slow spin
• OGLE-2018-BLG-0532Lb: Cold Neptune With Possible Jovian Sibling
• OGLE-2016-BLG-1003: First Resolved Caustic-crossing Binary-source Event Discovered by Second-generation Microlensing Surveys
• KELT-12b: A $P\sim 5$ Day, Highly Inflated Hot Jupiter Transiting a Mildly Evolved Hot Star
• Stellar Variability and Flare Rates from Dome A, Antarctica using 2009 and 2010 CSTAR Observations
• Discovery of a Gas giant Planet in Microlensing Event OGLE-2014-BLG-1760
• The OGLE Collection of Variable Stars. One Thousand Heartbeat Stars in the Galactic Bulge and Magellanic Clouds
• OGLE-2019-BLG-1470LABc: Another Microlensing Giant Planet in a Binary System?
• Very Low-mass Stellar and Substellar Companions to Solar-like Stars from MARVELS II: A Short-period Companion Orbiting an F Star with Evidence of a Stellar Tertiary And Significant Mutual Inclination
• The Wendelstein Calar Alto Pixellensing Project (WeCAPP): the M31 Nova catalogue
• Spectroscopic Determination of the Low Redshift Type Ia Supernova Rate from the Sloan Digital Sky Survey
• OGLE-2016-BLG-1227L: A Wide-separation Planet from a Very Short-timescale Microlensing Event
• $Spitzer$ Parallax of OGLE-2018-BLG-0596: A Low-mass-ratio Planet around an M-dwarf
• OGLE-2016-BLG-0168 Binary Microlensing Event: Prediction and Confirmation of the Micorlens Parallax Effect from Space-based Observation
• OGLE-2016-BLG-0596Lb: High-Mass Planet From High-Magnification Pure-Survey Microlensing Event
• Image Subtraction Reduction of Open Clusters M35 & NGC 2158 In The K2 Campaign-0 Super-Stamp
• Properties of M31. V: 298 Eclipsing Binaries from PAndromeda
• The Angstrom Project Alert System: real-time detection of extragalactic microlensing
• Photometric detection of high proper motions in dense stellar fields using Difference Image Analysis
• OGLE-2017-BLG-1186: first application of asteroseismology and Gaussian processes to microlensing
• The accretion burst of the massive young stellar object G323.46 -0.08
• A classification algorithm for time-domain novelties in preparation for LSST alerts: Application to variable stars and transients detected with DECam in the Galactic Bulge
• An AO-assisted variability study of four globular clusters
• A Gas Giant Planet in the OGLE-2006-BLG-284L Stellar Binary System
• A search for solar-like oscillations in K giants in the globular cluster M4
• Optical follow-up observation of Fast Radio Burst 151230
• Characterization of CoRoT target fields with BEST: Identification of periodic variable stars in the LRa1 field
• The fast transient AT 2023clx in the nearby LINER galaxy NGC 3799 as a tidal disruption of a very low-mass star
• OGLE-2015-BLG-0051/KMT-2015-BLG-0048Lb: a Giant Planet Orbiting a Low-mass Bulge Star Discovered by High-cadence Microlensing Surveys
• Photometric biases due to stellar blending: implications for measuring distances, constraining binarity and detecting exoplanetary transits
• The Blue Supergiant Progenitor of the Supernova Imposter AT~2019krl
• The MAVERIC Survey: Simultaneous Chandra and VLA observations of the transitional millisecond pulsar candidate NGC 6652B
• Exploring the Outer Solar System with the ESSENCE Supernova Survey
• Probing the Soft X-ray Properties and Multi-Wavelength Variability of SN2023ixf and its Progenitor
• Cluster AgeS Experiment (CASE): Deficiency of observed dwarf novae in globular clusters
• Astronomy from Dome A in Antarctica
• The zenithal 4-m International Liquid Mirror Telescope: a unique facility for supernova studies
• Variability of Optical Counterparts in the Chandra Galactic Bulge Survey
• Difference Imaging of Lensed Quasar Candidates in the SDSS Supernova Survey Region
• GPU Acceleration of Image Convolution using Spatially-varying Kernel
• MiNDSTEp differential photometry of the gravitationally lensed quasars WFI2033-4723 and HE0047-1756: Microlensing and a new time delay
• OGLE-2016-BLG-0263L\lowercase{b}: Microlensing Detection of a Very Low-mass Binary Companion Through a Repeating Event Channel
• Citizen ASAS-SN Data Release I: Variable Star Classification Using Citizen Science
• OGLE-2016-BLG-1045: A Test of Cheap Space-Based Microlens Parallaxes
• KMT-2019-BLG-0842Lb: A Cold Planet Below the Uranus/Sun Mass Ratio
• KMT-2019-BLG-1715: planetary microlensing event with three lens masses and two source stars
• Spitzer Microlensing parallax reveals two isolated stars in the Galactic bulge
• Automatized photometric monitoring of active galactic nuclei with the 46 cm telescope of the Wise observatory
• One Planet or Two Planets? The Ultra-sensitive Extreme-magnification Microlensing Event KMT-2019-BLG-1953
• Cluster AgeS Experiment (CASE): Detection of a dwarf nova in the globular cluster M55
• Sifting Through the Static: Moving Object Detection in Difference Images
• Spitzer Opens New Path to Break Classic Degeneracy for Jupiter-Mass Microlensing Planet OGLE-2017-BLG-1140Lb
• KMT-2016-BLG-1820 and KMT-2016-BLG-2142: Two Microlensing Binaries Composed of Planetary-mass Companions and Very-Low-Mass Primaries
• What's the Difference? The potential for Convolutional Neural Networks for transient detection without template subtraction
• The DEHVILS Survey Overview and Initial Data Release: High-Quality Near-Infrared Type Ia Supernova Light Curves at Low Redshift
• Difference image analysis: Automatic kernel design using information criteria
• SHARDS Frontier Fields: Physical properties of a low mass Lyman-alpha emitter at z=5.75
• KMT-2021-BLG-1898: Planetary microlensing event involved with binary source stars
• Linearized Field Deblending: PSF Photometry for Impatient Astronomers
• Revisiting the progenitor of the low-luminosity type II-plateau supernova, SN 2008bk
• KMT-2018-BLG-1025Lb: microlensing super-Earth planet orbiting a low-mass star
• Lensed quasar search via time variability with the HSC transient survey
• Light-Curve Structure and Halpha Line Formation in the Tidal Disruption Event AT 2019azh
• Discovery and Follow-up of ASASSN-23bd (AT 2023clx): The Lowest Redshift and Least Luminous Tidal Disruption Event To Date
• The first search for variable stars in the open cluster NGC 6253 and its surrounding field
• Object-X: The Brightest Mid-IR Point Source in M33
• Type Ib supernova Master OT J120451.50+265946.6: radio emitting shock with inhomogeneities crossing through a dense shell
• Characterizing the Rigidly Rotating Magnetosphere Stars HD 345439 and HD 23478
• Investigating Light Curve Modulation via Kernel Smoothing. I. Application to 53 fundamental mode and first-overtone Cepheids in the LMC
• OGLE-2016-BLG-1469L: Microlensing Binary Composed of Brown Dwarfs
• Photometric identification of the periods of the first candidate extragalactic magnetic massive stars
• Core-collapse supernova subtypes in luminous infrared galaxies
• KMT-2016-BLG-1107: A New Hollywood-Planet Close/Wide Degeneracy
• OGLE-2015-BLG-1670Lb: A Cold Neptune beyond the Snow Line in the Provisional WFIRST Microlensing Survey Field
• Properties of M31. III: Candidate Beat Cepheids from PS1 PAndromeda Data and Their Implication on Metallicity Gradient
• AT2018lqh and the nature of the emerging population of day-scale duration optical transients
• On the Performance of Quasar Reverberation Mapping in the Era of Time-Domain Photometric Surveys
• Velocity Effects on the Deflection of Light by Gravitational Microlenses
• Re-analysis of VLT Data for M83 with Image Subtraction -- Nine-fold Increase in Number of Cepheids
• Detecting Variability in Massive Astronomical Time-Series Data II: Variable Candidates in the Northern Sky Variability Survey
• The Type Ibn Supernova 2019kbj -- Indications for Diversity in Type Ibn Supernova Progenitors
• Twenty-One New Light Curves of OGLE-TR-56b: New System Parameters and Limits on Timing Variations
• Four Microlensing Planets with Faint-source Stars Identified in the 2016 and 2017 Season Data
• Finding $\eta$ Car Analogs in Nearby Galaxies Using Spitzer: II. Identification of An Emerging Class of Extragalactic Self-Obscured Stars
• Optical follow-up observation for GW event S190510g using Subaru/Hyper Suprime-Cam
• Towards Asteroid Detection in Microlensing Surveys with Deep Learning
• Difference image photometry with bright variable backgrounds
• Hubble Frontier Field Clusters and their Parallel Fields: Photometric and Photometric Redshift Catalogs
• The obscured hyper-energetic GRB 120624B hosted by a luminous compact galaxy at z = 2.20
• Implications for Galaxy Evolution from the Cosmic Evolution of Supernova Rate Density
• Liverpool-Maidanak monitoring of the Einstein Cross in 2006$-$2019. I. Light curves in the $gVrRI$ optical bands and microlensing signatures
• Kmt-2016-blg-1397b: Kmtnet-only discovery of a microlens giant planet
• The Sagittarius dwarf galaxy as a microlensing target
• KMT-2021-BLG-0912Lb: A microlensing super Earth around a K-type star
• KMT-2021-BLG-0240: Microlensing event with a deformed planetary signal
• Candidate Brown-dwarf Microlensing Events with Very Short Timescales and Small Angular Einstein Radii
• Detection of M31 Binaries via High-Cadence Pixel-Lensing Surveys
• Size distributions of bluish and reddish small main-belt asteroids obtained by Subaru/Hyper Suprime-Cam
• The Extraplanar Type II Supernova ASASSN-14jb in the Nearby Edge-on Galaxy ESO 467-G051
• OGLE-2013-BLG-0578L: Microlensing Binary Composed of A Brown Dwarf And An M Dwarf
• Properties of M31. IV: Candidate Luminous Blue Variables from PAndromeda
• WFIRST Ultra-Precise Astrometry I: Kuiper Belt Objects
• BVI Photometric Variability Survey of M3
• Four sub-Jovian-mass planets detected by high-cadence microlensing surveys
• A Discovery of Rapid Optical Flares from Low-Luminosity Active Nuclei in Massive Galaxies
• KMT-2019-BLG-0371 and the Limits of Bayesian Analysis
• Spitzer Microlensing of MOA-2016-BLG-231L : A Counter-Rotating Brown Dwarf Binary in the Galactic Disk
• The Flux Distribution and Sky Density of 25th Magnitude Main Belt Asteroids
• ROME/REA: A gravitational microlensing search for exo-planets beyond the snow-line on a global network of robotic telescopes
• Assessment of the Systematic Uncertainties in the Cosmological Analysis of the SDSS Supernovae Photometric Sample
• Discovery, Photometry, and Kinematics of Planetary Nebulae in M 82
• Multiple Outbursts of a Cataclysmic Variable in the Globular Cluster M22
• The Search for Failed Supernovae with the Large Binocular Telescope: N6946-BH1, Still No Star
• Microlensing optical depth, event rate, and limits on compact objects in dark matter based on 20 yr of OGLE observations of the Small Magellanic Cloud
• The Galactic Exoplanet Survey Telescope (GEST)
• Millimagnitude Optical Photometry for the Transiting Planetary Candidate OGLE-TR-109
• OGLE-2014-BLG-1186: gravitational microlensing providing evidence for a planet orbiting the foreground star or for a close binary source?
• SN 2014ab: An Aspherical Type IIn Supernova with Low Polarization
• KMT-2022-BLG-0440Lb: A New $q<10^{-4}$ Microlensing Planet with the Central-Resonant Caustic Degeneracy Broken
• A Search for L4 Earth Trojan Asteroids Using a Novel Track-Before-Detect Multi-Epoch Pipeline
• KMT-2018-BLG-1990Lb: A Nearby Jovian Planet From A Low-Cadence Microlensing Field
• A near infrared variable star survey in the Magellanic Clouds: The Small Magellanic Cloud data
• KMT-2019-BLG-0797: binary-lensing event occurring on a binary stellar system
• KMT-2018-BLG-1743: Planetary Microlensing Event Occurring on Two Source Stars
• VLT multi-epoch radial velocity survey toward NGC 6253. Analysis of three transiting planetary candidates
• An Effective Selection Method for Low-Mass Active Black Holes and First Spectroscopic Identification
• OGLE-2013-BLG-0911Lb: A Secondary on the Brown-Dwarf Planet Boundary around an M-dwarf
• Variable Stars in the Quintuplet stellar cluster with the VVV Survey
• Observational Evidence for the Effect of Amplification Bias in Gravitational Microlensing Experiments
• Detection of the second eclipsing high mass X-ray binary in M 33
• Variable stars in the bulge globular cluster NGC 6401
• The Nova Rate in M94 (NGC 4736)
• KMT-2018-BLG-1292: A Super-Jovian Microlens Planet in the Galactic Plane
• OGLE-2017-BLG-1130: The First Binary Gravitational Microlens Detected From Spitzer Only
• SCAT Uncovers ATLAS's First Tidal Disruption Event ATLAS18mlw: A Faint and Fast TDE in a Quiescent Balmer Strong Galaxy
• OGLE-2014-BLG-0289: Precise Characterization of a Quintuple-Peak Gravitational Microlensing Event
• Variable stars in the core of the globular cluster M3
• Performance analysis of the Least-Squares estimator in Astrometry
• TESS Shines Light on the Origin of the Ambiguous Nuclear Transient ASASSN-18el
• The Nova Rate in NGC 2403
• MOA Data Reveal a New Mass, Distance, and Relative Proper Motion for Planetary System OGLE-2015-BLG-0954L
• OGLE-2012-BLG-0455/MOA-2012-BLG-206: Microlensing event with ambiguity in planetary interpretations caused by incomplete coverage of planetary signal
• A Deep Catalog of Variable Stars in a 0.66deg^2 Lupus Field
• Going Forward with the Nancy Grace Roman Space Telescope Transient Survey: Validation of Precision Forward-Modeling Photometry for Undersampled Imaging
• J-GEM optical and near-infrared follow-up of gravitational wave events during LIGO's and Virgo's third observing run
• A Search for Variable Stars in the Globular Cluster M4 with K2
• Variability and stellar populations with deep optical-IR images of the Milky Way disk: matching VVV with VLT/VIMOS data
• A Catalog of Periodic Variables in Open Clusters M35 and NGC 2158
• The Evryscope Fast Transient Engine: Real-Time Detection for Rapidly Evolving Transients
• OGLE-2018-BLG-1269Lb: A Jovian Planet With A Bright, $I=16$ Host
• The Hubble Catalog of Variables (HCV)
• A Method For Eclipsing Component Identification In Large Photometric Datasets
• MDia and POTS - The Munich Difference Imaging Analysis for the pre-OmegaTranS Project
• Ground-based parallax confirmed by Spitzer: binary microlensing event MOA-2015-BLG-020
• A time domain experiment with Swift: monitoring of seven nearby galaxies
• KELT: The Kilodegree Extremely Little Telescope, a Survey for Exoplanets Transiting Bright, Hot Stars
• The Berlin Exoplanet Search Telescope II. Catalog of Variable Stars. I. Characterization of Three Southern Target Fields
• The Kepler IRIS Catalog: Image subtraction light curves for 9,150 stars in and around the open clusters NGC 6791 and NGC 6819
• Variable stars in the field of the old open cluster Melotte 66
• A hot Jupiter transiting a mid-K dwarf found in the pre-OmegaCam Transit Survey
• DIAmante TESS AutoRegressive Planet Search (DTARPS): I. Analysis of 0.9 Million Light Curves
• Recovered SN Ia rate from simulated LSST images
• Application of Convolutional Neural Networks to time domain astrophysics. 2D image analysis of OGLE light curves
• Discovery of Five Candidate Analogs for $\eta$Carinae in Nearby Galaxies
• Follow-up survey for the binary black hole merger GW200224_222234 using Subaru/HSC and GTC/OSIRIS
• KMT-2021-BLG-2010Lb, KMT-2022-BLG-0371Lb, and KMT-2022-BLG-1013Lb: Three microlensing planets detected via partially covered signals
• 1318 New Variable Stars in a 0.25 Square Degree Region of the Galactic Plane
• Kepler K2 Campaign 9: I. Candidate short-duration events from the first space-based survey for planetary microlensing
• Detection of IMBHs from microlensing in globular clusters
• Shortest Microlensing Event with a Bound Planet: KMT-2016-BLG-2605
• Many new variable stars discovered in the core of the globular cluster NGC 6715 (M54) with EMCCD observations
• Automation of the AST3 optical sky survey from Dome~A, Antarctica
• A rapidly declining transient discovered with Subaru/Hyper Suprime-Cam
• Constraints on the rate of supernovae lasting for more than a year from Subaru/Hyper Suprime-Cam
• RATIR Followup of LIGO/Virgo Gravitational Wave Events
• A novel method for transient detection in high-cadence optical surveys: Its application for a systematic search for novae in M31
• KMT-2019-BLG-1339L: an M Dwarf with a Giant Planet or a Companion Near the Planet/Brown Dwarf Boundary
• Optimality of the Maximum Likelihood estimator in Astrometry
• OGLE-2017-BLG-0537: Microlensing Event with a Resolvable Lens in $\lesssim 5$ years from High-resolution Follow-up Observations
• The Unusual Variability of the Large Magellanic Cloud Planetary Nebula RPJ 053059-683542
• KMT-2016-BLG-1836Lb: A Super-Jovian Planet From A High-Cadence Microlensing Field
• OGLE-2014-BLG-1112LB: A Microlensing Brown Dwarf Detected Through the Channel of a Gravitational Binary-Lens Event
• Optical Continuum Reverberation Mapping of a Candidate IMBH in a Nearby Seyfert 1 Galaxy
• Accurate fundamental parameters and distance to a massive early-type eclipsing binary in the Danks 2 cluster
• Discovery of an Outbursting 12.8 Minute Ultracompact X-Ray Binary
• Detection efficiency and photometry in supernova surveys - the Stockholm VIMOS Supernova Survey I
• Detecting optical transients using artificial neural networks and reference images from different surveys
• Ground-based variability surveys towards Centaurus A: worthwhile or not?
• A search for the near-infrared counterpart of the eclipsing millisecond X-ray pulsar Swift J1749.4-2807
• OGLE-2018-BLG-0799Lb: a $q\sim 2.7\times 10^{-3}$ Planet with Spitzer Parallax
• Gemini Spectroscopy of Galactic Bulge Sources: A Population of Hidden Accreting Binaries Revealed?
• Systematic KMTNet Planetary Anomaly Search. XII. Complete Sample of 2017 Subprime Field Planets
• Colour Change Measurements of Gravitational Microlensing Events by Using the Difference Image Analysis Method
• The discovery and classification of 16 supernovae at high redshifts in ELAIS-S1 - the Stockholm VIMOS Supernova Survey II
• Deep-learning Real/Bogus classification for the Tomo-e Gozen transient survey
• OGLE-2017-BLG-0482Lb: A Microlensing Super-Earth Orbiting a Low-mass Host Star
• Near-ultraviolet detections of four dwarf nova candidates in the globular cluster 47 Tucanae
• The Sloan Digital Sky Survey Reverberation Mapping Project: Photometric g and i Light Curves
• OGLE-2019-BLG-0960Lb: The Smallest Microlensing Planet
• Automated Transient Detection with Shapelet Analysis in Image-subtracted Data
• OGLE-2017-BLG-0329L: A Microlensing Binary Characterized with Dramatically Enhanced Precision Using Data from Space-based Observations
• The Gaia-ASAS-SN classical Cepheids sample: I. Sample Selection
• Application of the Trend Filtering Algorithm on the MACHO Database
• Revealing the progenitor of SN 2021zby through analysis of the $TESS$ shock-cooling light curve
• Unbiased reconstruction of the mass function using microlensing survey data
• Separating inner and outer contributions in gravitational lenses using the perturbative method
• An analysis of binary microlensing event OGLE-2015-BLG-0060
• H-band light curves of Milky Way Cepheids via Difference Imaging
• Optimising Optimal Image Subtraction
• A Method for Extracting Light Echo Fluxes Using the NN2 Difference Imaging Technique
• Self-Supervised Clustering on Image-Subtracted Data with Deep-Embedded Self-Organizing Map
• Disentangling transients and their host galaxies with Scarlet2: A framework to forward model multi-epoch imaging
• Variable stars in the globular cluster M28 (NGC 6626)
• The bright long-lived Type II SN 2021irp powered by aspherical circumstellar material interaction (I): Revealing the energy source with photometry and spectroscopy
• Precision measurement of a brown dwarf mass in a binary system in the microlensing event OGLE-2019-BLG-0033/MOA-2019-BLG-035
• The OGLE-II event sc5_2859 -- An example of disk-disk microlensing
• A hot horizontal branch star with a close K-type main-sequence companion
• A Search for Transiting Planets in the Globular Cluster M4 with K2: Candidates and Occurrence Limits
• Monitoring of the Central Region of the Globular Cluster M15 = NGC 7078: New Variable Stars
• Constraining the Location of Microlensing Objects by using the Finite Source Effect in EAGLE events
• A New Method For Robust High-Precision Time-Series Photometry From Well-Sampled Images: Application to Archival MMT/Megacam Observations of the Open Cluster M37
• KMT-2016-BLG-2052L: Microlensing Binary Composed of M Dwarfs Revealed from a Very Long Time-scale Event
• TUVOpipe: a pipeline to search for UV transients with Swift-UVOT
• First Resolution of Microlensed Images of a Binary-Lens Event
• Time-Series BVI Photometry for the Globular Cluster NGC 6981 (M72)
• OGLE-2019-BLG-0304: Competing Interpretations between a Planet-binary Model and a Binary-source + Binary-lens model
• Variables in Globular Cluster NGC 5024
• PyTorchDIA: A flexible, GPU-accelerated numerical approach to Difference Image Analysis
• Ground and space-based study of two globular cluster CVs: M22 CV1 and M5 V101
• OGLE-2018-BLG-1428Lb: a Jupiter-mass planet beyond the snow line of a dwarf star
• MOA-2019-BLG-008Lb: a new microlensing detection of an object at the planet/brown dwarf boundary
• Strongly lensed candidates from the HSC transient survey
• Deep census of variable stars in a VLT/VIMOS field in Carina
• Searching for Gravitational-Wave Counterparts using the Transiting Exoplanet Survey Satellite
• KMT-2022-BLG-2397: Brown Dwarf at the Upper Shore of the Einstein Desert
• Near-infrared evolution of the equatorial ring of SN 1987A
• Can Jupiters be found by monitoring Galactic Bulge microlensing events from northern sites?
• Microlens Surveys are a Powerful Probe of Asteroids
• Reference image selection for difference imaging analysis
• Hawai'i Supernova Flows: A Peculiar Velocity Survey Using Over a Thousand Supernovae in the Near-Infrared
• Variability and transient search in the SUDARE-VOICE field: a new method to extract the light curves
• TOROS Optical follow-up of the Advanced LIGO-VIRGO O2 second observational campaign
• Progenitor constraints for core-collapse supernovae from Chandra X-ray observations
• An R- and I-Band Photometric Variability Survey of the Cygnus OB2 Association
• Blind Analysis of CT Image Noise Using Residual Denoised Images
• Follow-up Observations for IceCube-170922A: Detection of Rapid Near-Infrared Variability and Intensive Monitoring of TXS 0506+056
• Variable Stars in the Large Magellanic Cloud: Discovery of Extragalactic W UMa Binaries
• The Thresher: Lucky Imaging without the Waste
• Photometric study of hot Algol-type binaries with long cycles
• Millinovae: A New Class of Transient Supersoft X-ray Sources without a Classical Nova Eruption
• A Survey of Novae in M83
• Mass Production of 2021 KMTNet Microlensing Planets II
• High frequency breaks in optical active galactic nuclei power spectral density
• A Wide-Field Survey for Transiting Hot Jupiters and Eclipsing Pre-Main-Sequence Binaries in Young Stellar Associations
• Differencing and Coadding JWST Images with Matched Point Spread Function
• Resolving Microlensing Events with Triggered VLBI
• On the Baseline Flux Determination of Microlensing Events Detectable with the Difference Image Analysis Method
• The Gravitational-wave Optical Transient Observer (GOTO): prototype performance and prospects for transient science
• An Earth-mass Planet in a Time of Covid-19: KMT-2020-BLG-0414Lb
• Textual interpretation of transient image classifications from large language models
• KMT-2025-BLG-1616Lb: First Microlensing Bound Planet From DREAMS
• V5852 Sgr: An Unusual Nova Possibly Associated with the Sagittarius Stream
• Infrared observations reveal the reprocessing envelope in the tidal disruption event AT 2019azh
• The POINT-AGAPE Survey: Comparing Automated Searches of Microlensing Events toward M31
• Observations from Australasia using the Gravitational Microlensing Technique
• Improving the light curves of gravitationally lensed quasars with Gaia proper motion data
• New variable sources revealed by DECam toward the LMC: the first 15 deg2
• Constraining the Location of Microlensing Objects towards the LMC through Parallax Measurement in EAGLE Observations
• A second neutron star in M4?
• The expansion of the universe observed with supernovae
• Blending in Future Space-based Microlensing Surveys
• MOA-2020-BLG-208Lb: Cool Sub-Saturn Planet Within Predicted Desert
• $\texttt{HostSub_GP}$: Precise Galaxy Background Subtraction in Transient Long-slit Spectroscopy with Gaussian Processes
• OGLE-2016-BLG-0156: Microlensing Event With Pronounced Microlens-Parallax Effects Yielding Precise Lens Mass Measurement
• OGLE-2018-BLG-0022: First Prediction of an Astrometric Microlensing Signal from a Photometric Microlensing Event
• Detecting Exoplanets by Gravitational Microlensing using a Small Telescope
• HST pre-imaging of a free-floating planet candidate microlensing event
• Unusual Long and Luminous Optical Transient in the Subaru Deep Field
• OGLE-2014-BLG-0319: A Sub-Jupiter-Mass Planetary Event Encountered Degeneracy with Different Mass Ratios and Lens-Source Relative Proper Motions
• Decadal Variability Survey in MACSJ1149
• Using Source Proper Motion to Validate Terrestrial Parallax: OGLE-2019-BLG-1058
• Improved period variations of 32 contact binaries with rapidly decreasing periods in the Galactic Bulge
• Synergies between Exoplanet Surveys and Variable Star Research
• OGLE-2017-BLG-1038: A Possible Brown-dwarf Binary Revealed by Spitzer Microlensing Parallax
• The LOFAR Transients Pipeline
• A long-duration gamma-ray burst of dynamical origin from the nucleus of an ancient galaxy
• Finding the Brightest Galactic Bulge Microlensing Events with a Small Aperture Telescope and Image Subtraction
• Variability of Young Massive Stars in the Arches Cluster
• M33 Cepheids from CFHT/MegaCAM survey
• OGLE-2015-BLG-1609Lb: Sub-jovian planet orbiting a low-mass stellar or brown dwarf host
• Two c's in a pod: Cosmology independent measurement of the Type Ia supernova colour-luminosity relation with a sibling pair
• Detection of IMBHs from microlensing in globular clusters
• SuperLupus: A Deep, Long Duration Transit Survey
• New variable stars in NGC 6652 and its background Sagittarius stream
• Optimizing Convolution Direction and Template Selection for Difference Image Analysis
• Detection of colour variations from gravitational microlensing observations in the quadruple quasar HE0435-1223: Implications for the accretion disk
• Techniques for Observing Binaries in Other Galaxies
• Eclipsing Binaries in the Young LMC Cluster NGC 1850
• Digging deeper into the dense Galactic globular cluster Terzan 5 with Electron-Multiplying CCDs. Variable star detection and new discoveries
• Image Subtraction Noise Reduction Using Point Spread Function Cross-correlation
• $\beta$-SGP: Scaled Gradient Projection with $\beta$-divergence for astronomical image restoration
• The Princeton Variability Survey
• Searching for Intermediate Mass Black Holes in the Milky Way's galactic halo
• Effect of Binary Source Companions on the Microlensing Optical Depth Determination toward the Galactic Bulge Field
• Galactic Bulge Pixel Lensing Events
• A large-scale survey for variable stars in M33
• KMT-2021-BLG-1150Lb: Microlensing planet detected through a densely covered planetary-caustic signal
• ASAS-SN search for optical counterparts of gravitational-wave events from the third observing run of Advanced LIGO/Virgo
• Extra-galactic distances with massive stars: the role of stellar variability in the case of M33
• KMT-2018-BLG-1988Lb: microlensing super-Earth orbiting a low-mass disk dwarf
• Wide-field variability survey of the globular cluster NGC 4833
• KMT-2025-BLG-1314 and KMT-2025-BLG-1392: two microlensing planetary/brown-dwarf candidates analyzed with differentiable code
• Characterizing crosstalk within the Pan-STARRS GPC1 camera
• [HP99] 159 -- Properties of the first Supersoft X-ray Source with a Helium star donor
• First Search for an X-ray -- Optical Reverberation Signal in an Ultraluminous X-ray Source
• Investigating the Effects of Point Source Injection Strategies on KMTNet Real/Bogus Classification
• Real-Time Detection and Classification of Astronomical Transient Events: The State-of-the-Art
• Variability Selected Active Galactic Nuclei from ASAS-SN Survey: Constraining the Low Luminosity AGN Population
• Microlensing and Variability in the Bulge of M31
• KMT-2021-BLG-0322: Severe degeneracy between triple-lens and higher-order binary-lens interpretations
• Exploring the crowded central region of 10 Galactic globular clusters using EMCCDs. Variable star searches and new discoveries
• Variable stars in the globular cluster M13
• The Multiband Imaging Survey for High-Alpha PlanetS (MISHAPS) I: Preliminary Constraints on the Occurrence Rate of Hot Jupiters in 47 Tucanae
• Current Status of the Microlensing Surveys
• Microlensing by free-floating brown dwarfs
• A Detailed View of the Broad Line Region in NGC 3783 from Velocity-Resolved Reverberation Mapping
• Multi-color Optical and NIR Light Curves of 64 Stripped-Envelope Core-Collapse Supernovae
• Casting Light on Degeneracies: A Comprehensive Study of Lightcurve Variations in Microlensing Events OGLE-2017-BLG-0103 and OGLE-2017-BLG-0192
• The Variable Sky Through the OGLE Eye
• Three faint-source microlensing planets detected via resonant-caustic channel
• An Efficient Shift-and-Stack Algorithm Applied to Detection Catalogs
• TESS's First Bound Microlensing Planet: A Binary Microlensing Event Revealing a Planetary Companion toward the Galactic Plane
• Another Channel to detect Close-in Binary Companions via Gravitational Microlensing
• Tidally excited oscillations in MACHO 80.7443.1718: Changing amplitudes and frequencies, high-frequency tidally excited mode, and a decrease in the orbital period
• A Minute-Cadence Deep Bulge Survey: First Data Release of DREAMS
• MOA-2020-BLG-135Lb: A New Neptune-class Planet for the Extended MOA-II Exoplanet Microlens Statistical Analysis