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Multiple Flares in the Changing-Look AGN NGC 5273
J. M. M. Neustadt, J. T. Hinkle, C. S. Kochanek +15
NGC 5273 is a known optical and X-ray variable AGN. We analyze new and archival IR, optical, UV, and X-ray data in order to characterize its long-term variability from 2000 to 2022…
Optical/-ray blazar flare correlations: understanding the high-energy emission process using ASAS-SN and Fermi light curves
T. de Jaeger, B. J. Shappee, C. S. Kochanek +7
Using blazar light curves from the optical All-Sky Automated Survey for Supernovae (ASAS-SN) and the -ray \textit{Fermi}-LAT telescope, we performed the most extensive statistic…
Chandra, HST/STIS, NICER, Swift, and TESS Detail the Flare Evolution of the Repeating Nuclear Transient ASASSN-14ko
Anna V. Payne, Katie Auchettl, Benjamin J. Shappee +9
ASASSN-14ko is a nuclear transient at the center of the AGN ESO 253-G003 that undergoes periodic flares. Optical flares were first observed in 2014 by the All-Sky Automated Survey…
ASAS-SN follow-up of IceCube high-energy neutrino alerts
Jannis Necker, Thomas de Jaeger, Robert Stein +12
We report on the search for optical counterparts to IceCube neutrino alerts released between April 2016 and August 2021 with the All-Sky Automated Survey for SuperNovae (ASAS-SN).…
The Whisper of a Whimper of a Bang: 2400 Days of the Type Ia SN 2011fe Reveals the Decay of Fe
M. A. Tucker, B. J. Shappee, C. S. Kochanek +4
We analyze new multi-filter Hubble Space Telescope (HST) photometry of the normal Type Ia supernova (SN Ia) 2011fe out to days after maximum light, the latest observ…
A Rapid Ionization Change in the Nebular-Phase Spectra of the Type Ia SN 2011fe
M. A. Tucker, C. Ashall, B. J. Shappee +3
We present three new spectra of the nearby Type Ia supernova (SN Ia) 2011fe covering days after maximum light and show that the ejecta undergoes a rapid ionizatio…
ASAS-SN search for optical counterparts of gravitational-wave events from the third observing run of Advanced LIGO/Virgo
T. de Jaeger, B. J. Shappee, C. S. Kochanek +6
We report on the search for electromagnetic counterparts to the nine gravitational-wave events with a 60\% probability of containing a neutron star during the third (O3) LIGO-Vi…
The Curious Case of ASASSN-20hx: A Slowly-Evolving, UV and X-ray Luminous, Ambiguous Nuclear Transient
Jason T. Hinkle, Thomas W. -S. Holoien, Benjamin. J. Shappee +22
We present observations of ASASSN-20hx, a nearby ambiguous nuclear transient (ANT) discovered in NGC 6297 by the All-Sky Automated Survey for Supernovae (ASAS-SN). We observed ASAS…
The Rapid X-ray and UV Evolution of ASASSN-14ko
Anna V. Payne, Benjamin J. Shappee, Jason T. Hinkle +13
ASASSN-14ko is a recently discovered periodically flaring transient at the center of the AGN ESO 253-G003 with a slowly decreasing period. Here we show that the flares originate fr…
The Changing Look Blazar B2 1420+32
Hora D. Mishra, Xinyu Dai, Ping Chen +22
Blazars are active galactic nuclei with their relativistic jets pointing toward the observer, with two major sub-classes, the flat spectrum radio quasars and BL Lac objects. We pre…
The First Data Release of CNIa0.02 -- A Complete Nearby (Redshift <0.02) Sample of Type Ia Supernova Light Curves
Ping Chen, Subo Dong, C. S. Kochanek +41
The CNIa0.02 project aims to collect a complete, nearby sample of Type Ia supernovae (SNe Ia) light curves, and the SNe are volume-limited with host-galaxy redshifts z_host < 0.02.…
High-Cadence, Early-Time Observations of Core-Collapse Supernovae From the TESS Prime Mission
P. J. Vallely, C. S. Kochanek, K. Z. Stanek +2
We present observations from the Transiting Exoplanet Survey Satellite (TESS) of twenty bright core-collapse supernovae with peak TESS-band magnitudes mag. We reduce t…
ASASSN-14ko is a Periodic Nuclear Transient in ESO 253-G003
Anna V. Payne, Benjamin J. Shappee, Jason T. Hinkle +24
We present the discovery that ASASSN-14ko is a periodically flaring AGN at the center of the galaxy ESO 253-G003. At the time of its discovery by the All-Sky Automated Survey for S…
Discovery and Follow-up of ASASSN-19dj: An X-ray and UV Luminous TDE in an Extreme Post-Starburst Galaxy
Jason T. Hinkle, T. W. -S. Holoien, K. Auchettl +28
We present observations of ASASSN-19dj, a nearby tidal disruption event (TDE) discovered in the post-starburst galaxy KUG 0810+227 by the All-Sky Automated Survey for Supernovae (A…
Response to Comment on "A Non-Interacting Low-Mass Black Hole -- Giant Star Binary System"
Todd A. Thompson, Christopher S. Kochanek, Krzysztof Z. Stanek +7
van den Heuvel & Tauris argue that if the red giant star in the system 2MASS J05215658+4359220 has a mass of 1 solar mass (M), then its unseen companion could be a binary c…
Examining a Peak-Luminosity/Decline-Rate Relationship for Tidal Disruption Events
Jason T. Hinkle, Thomas W. -S. Holoien, Benjamin. J. Shappee +5
We compare the luminosity, radius, and temperature evolution of the UV/optical blackbodies for 21 well-observed tidal disruption events (TDEs), 8 of which were discovered by the Al…
Discovery and Early Evolution of ASASSN-19bt, the First TDE Detected by TESS
Thomas W. -S. Holoien, Patrick J. Vallely, Katie Auchettl +22
We present the discovery and early evolution of ASASSN-19bt, a tidal disruption event (TDE) discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN) at a distance of $d\…
ASASSN-15pz: Revealing Significant Photometric Diversity among 2009dc-like, Peculiar SNe Ia
Ping Chen, Subo Dong, Boaz Katz +17
We report comprehensive multi-wavelength observations of a peculiar Type Ia-like supernova ("SN Ia-pec") ASASSN-15pz. ASASSN-15pz is a spectroscopic "twin" of SN 2009dc, a so-calle…
Flaring, Dust Formation, And Shocks In The Very Slow Nova ASASSN-17pf (LMCN 2017-11a)
E. Aydi, L. Chomiuk, J. Strader +25
We present a detailed study of the 2017 eruption of the classical nova ASASSN-17pf (LMCN 2017-11a), which is located in the Large Magellanic Cloud, including data from AAVSO, ASAS-…
Investigation of two Fermi-LAT gamma-ray blazars coincident with high-energy neutrinos detected by IceCube
S. Garrappa, S. Buson, A. Franckowiak +338
After the identification of the gamma-ray blazar TXS 0506+056 as the first compelling IceCube neutrino source candidate, we perform a systematic analysis of all high-energy neutrin…
The Extraplanar Type II Supernova ASASSN-14jb in the Nearby Edge-on Galaxy ESO 467-G051
Nicolas Meza, J. L. Prieto, A. Clocchiatti +10
We present optical photometry and spectroscopy of the Type II supernova ASASSN-14jb, together with VLT MUSE IFU observations of its host galaxy and a nebular-phase spectrum. This S…
The ASAS-SN Bright Supernova Catalog -- IV. 2017
T. W. -S. Holoien, J. S. Brown, P. J. Vallely +41
In this catalog we compile information for all supernovae discovered by the All-Sky Automated Survey for SuperNovae (ASAS-SN) as well as all other bright (), spectr…
The Cow: discovery of a luminous, hot and rapidly evolving transient
S. J. Prentice, K. Maguire, S. J. Smartt +27
We present the ATLAS discovery and initial analysis of the first 18 days of the unusual transient event, ATLAS18qqn/AT2018cow. It is characterized by a high peak luminosity (…
ASASSN-18ey: The Rise of a New Black-Hole X-ray Binary
M. A. Tucker, B. J. Shappee, T. W. -S. Holoien +21
We present the discovery of ASASSN-18ey (MAXI J1820+070), a new black hole low-mass X-ray binary discovered by the All-Sky Automated Survey for SuperNovae (ASAS-SN). A week after A…