Swift/UVOT follow-up of Gravitational Wave Alerts in the O3 era

Abstract

In this paper, we report on the observational performance of the Swift Ultra-violet/Optical Telescope (UVOT) in response to the Gravitational Wave alerts announced by the Advanced Laser Interferometer Gravitational Wave Observatory and the Advanced Virgo detector during the O3 period. We provide the observational strategy for follow-up of GW alerts and provide an overview of the processing and analysis of candidate optical/UV sources. For the O3 period, we also provide a statistical overview and report on serendipitous sources discovered by Swift/UVOT. Swift followed 18 gravitational-wave candidate alerts, with UVOT observing a total of 424 deg^2. We found 27 sources that changed in magnitude at the 3 sigma level compared with archival u or g-band catalogued values. Swift/UVOT also followed up a further 13 sources reported by other facilities during the O3 period. Using catalogue information, we divided these 40 sources into five initial classifications: 11 candidate active galactic nuclei (AGN)/quasars, 3 Cataclysmic Variables (CVs), 9 supernovae, 11 unidentified sources that had archival photometry and 6 uncatalogued sources for which no archival photometry was available. We have no strong evidence to identify any of these transients as counterparts to the GW events. The 17 unclassified sources are likely a mix of AGN and a class of fast-evolving transient, and one source may be a CV.

25 pages, 6 figures and 5 tables. Submitted to MNRAS. Supplementary contains 23 pages with 8 figures and 1 table

References in corpus (87)

• Advanced Virgo: a 2nd generation interferometric gravitational wave detector
• Multi-messenger Observations of a Binary Neutron Star Merger
• Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
• GWTC-2: Compact Binary Coalescences Observed by LIGO and Virgo During the First Half of the Third Observing Run
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• GW190814: Gravitational Waves from the Coalescence of a 23 M${}_{\odot }$ Black Hole with a 2.6 M${}_{\odot }$ Compact Object
• GW190425: Observation of a Compact Binary Coalescence with Total Mass $\sim 3.4M_{\odot }$
• An Ordinary Short Gamma-Ray Burst with Extraordinary Implications: Fermi-GBM Detection of GRB 170817A
• GW190521: A Binary Black Hole Merger with a Total Mass of $150M_{\odot }$
• A gravitational-wave standard siren measurement of the Hubble constant
• LIGO: The Laser Interferometer Gravitational-Wave Observatory
• Swope Supernova Survey 2017a (SSS17a), the Optical Counterpart to a Gravitational Wave Source
• The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. II. UV, Optical, and Near-IR Light Curves and Comparison to Kilonova Models
• Spectroscopic identification of r-process nucleosynthesis in a double neutron star merger
• INTEGRAL Detection of the First Prompt Gamma-Ray Signal Coincident with the Gravitational Wave Event GW170817
• A kilonova as the electromagnetic counterpart to a gravitational-wave source
• The X-ray counterpart to the gravitational wave event GW 170817
• The Zwicky Transient Facility: Science Objectives
• Light Curves of the Neutron Star Merger GW170817/SSS17a: Implications for R-Process Nucleosynthesis
• Illuminating Gravitational Waves: A Concordant Picture of Photons from a Neutron Star Merger
• The Emergence of a Lanthanide-Rich Kilonova Following the Merger of Two Neutron Stars
• GW190412: Observation of a Binary-Black-Hole Coalescence with Asymmetric Masses
• Optical emission from a kilonova following a gravitational-wave-detected neutron-star merger
• Comprehensive nucleosynthesis analysis for ejecta of compact binary mergers
• The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/Virgo GW170817. I. Dark Energy Camera Discovery of the Optical Counterpart
• Swift and NuSTAR observations of GW170817: detection of a blue kilonova
• The Combined Ultraviolet, Optical, and Near-Infrared Light Curves of the Kilonova Associated with the Binary Neutron Star Merger GW170817: Unified Data Set, Analytic Models, and Physical Implications
• The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. IV. Detection of Near-infrared Signatures of r-process Nucleosynthesis with Gemini-South
• A Radio Counterpart to a Neutron Star Merger
• The Second-Generation Guide Star Catalog: Description and Properties
• The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. III. Optical and UV Spectra of a Blue Kilonova From Fast Polar Ejecta
• Neutrino-driven winds from neutron star merger remnants
• Kilonovae
• The discovery of the electromagnetic counterpart of GW170817: kilonova AT 2017gfo/DLT17ck
• Candidate Electromagnetic Counterpart to the Binary Black Hole Merger Gravitational Wave Event S190521g
• The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. V. Rising X-ray Emission from an Off-Axis Jet
• The XMM-Newton serendipitous survey IX. The fourth XMM-Newton serendipitous source catalogue
• Seventeen Tidal Disruption Events from the First Half of ZTF Survey Observations: Entering a New Era of Population Studies
• Kilonova Light Curves from the Disk Wind Outflows of Compact Object Mergers
• Physical properties of 15 quasars at $z\gtrsim 6.5$
• MASTER optical detection of the first LIGO/Virgo neutron stars merging GW170817
• Merger and Mass Ejection of Neutron-Star Binaries
• The WISE AGN Catalog
• A Deep Chandra X-ray Study of Neutron Star Coalescence GW170817
• Follow up of GW170817 and its electromagnetic counterpart by Australian-led observing programs
• J-GEM observations of an electromagnetic counterpart to the neutron star merger GW170817
• Optical-Ultraviolet Tidal Disruption Events
• Neutron-powered precursors of kilonovae
• Jet Breaks in Short Gamma-Ray Bursts. II: The Collimated Afterglow of GRB 051221A
• The optical afterglow of GW170817 at one year post-merger
• The Rapid Reddening and Featureless Optical Spectra of the optical counterpart of GW170817, AT 2017gfo, During the First Four Days
• Two years of non-thermal emission from the binary neutron star merger GW170817: rapid fading of the jet afterglow and first constraints on the kilonova fastest ejecta
• Observations of the first electromagnetic counterpart to a gravitational wave source by the TOROS collaboration
• Diversity of kilonova light curves
• GRB170817A associated with GW170817: multifrequency observations and modeling of prompt gamma-ray emission
• The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. VIII. A Comparison to Cosmological Short-duration Gamma-ray Bursts
• A thousand days after the merger: continued X-ray emission from GW170817
• Improved constraints on H0 from a combined analysis of gravitational-wave and electromagnetic emission from GW170817
• GROWTH on S190814bv: Deep Synoptic Limits on the Optical/Near-Infrared Counterpart to a Neutron Star-Black Hole Merger
• Searching for Electromagnetic Counterparts to Gravitational-wave Merger Events with the Prototype Gravitational-wave Optical Transient Observer (GOTO-4)
• Axisymmetric Radiative Transfer Models of Kilonovae
• Optical follow-up of the neutron star-black hole mergers S200105ae and S200115j
• The Optical Afterglow of GW170817: An Off-axis Structured Jet and Deep Constraints on a Globular Cluster Origin
• Kilonova Luminosity Function Constraints based on Zwicky Transient Facility Searches for 13 Neutron Star Mergers
• GRANDMA Observations of Advanced LIGO's and Advanced Virgo's Third Observational Campaign
• Implications of the search for optical counterparts during the first six months of the Advanced LIGO's and Advanced Virgo's third observing run: possible limits on the ejecta mass and binary properties
• Observational constraints on the optical and near-infrared emission from the neutron star-black hole binary merger S190814bv
• Current observations are insufficient to confidently associate the binary black hole merger GW190521 with AGN J124942.3+344929
• Do LIGO/Virgo black hole mergers produce AGN flares? The case of GW190521 and prospects for reaching a confident association
• The Broad-band Counterpart of the Short GRB 200522A at $z=0.5536$: A Luminous Kilonova or a Collimated Outflow with a Reverse Shock?
• Evidence for Dynamically Driven Formation of the GW170817 Neutron Star Binary in NGC 4993
• An ASKAP search for a radio counterpart to the first high-significance neutron star-black hole merger LIGO/Virgo S190814bv
• A Galaxy-Targeted Search for the Optical Counterpart of the Candidate NS-BH Merger S190814bv with Magellan
• Short gamma-ray bursts within 200 Mpc
• Implications of the search for optical counterparts during the second part of the Advanced LIGO's and Advanced Virgo's third observing run: lessons learned for future follow-up observations
• Gamma-ray Urgent Archiver for Novel Opportunities (GUANO): Swift/BAT event data dumps on demand to enable sensitive sub-threshold GRB searches
• A Deep CFHT Optical Search for a Counterpart to the Possible Neutron Star -- Black Hole Merger GW190814
• The Gravitational Wave Treasure Map: A Tool to Coordinate, Visualize, and Assess the Electromagnetic Follow-Up of Gravitational Wave Events
• A search for optical and near-infrared counterparts of the compact binary merger GW190814
• Swift-XRT follow-up of gravitational wave triggers during the third aLIGO/Virgo observing run
• Searches after Gravitational Waves Using ARizona Observatories (SAGUARO): Observations and Analysis from Advanced LIGO/Virgo's Third Observing Run
• Lanthanides or dust in kilonovae: lessons learned from GW170817
• Limits on electromagnetic counterparts of gravitational wave-detected binary black hole mergers
• Swift-XRT Follow-up of Gravitational Wave Triggers in the Second Advanced LIGO/Virgo Observing Run
• Optical follow-up observation for GW event S190510g using Subaru/Hyper Suprime-Cam
• Swift Multiwavelength Follow-up of LVC S200224ca and the Implications for Binary Black Hole Mergers
• GW170817: $\text{Swift}$ UV detection of a blue kilonova, and improving the search in O3

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• Target of Opportunity Observations of Gravitational Wave Events with Vera C. Rubin Observatory
• An Infrared Search for Kilonovae with the WINTER Telescope. I. Binary Neutron Star Mergers
• Constraints on the electromagnetic counterpart of the Neutron Star Black Hole merger GW200115
• A Systematic Exploration of Kilonova Candidates from Neutron Star Mergers During the Third Gravitational Wave Observing Run
• Eighteen Years of Kilonova Discoveries with Swift
• Panning for gold, but finding helium: discovery of the ultra-stripped supernova SN2019wxt from gravitational-wave follow-up observations
• SAGUARO: Time-domain Infrastructure for the Fourth Gravitational-wave Observing Run and Beyond
• Follow-up survey for the binary black hole merger GW200224_222234 using Subaru/HSC and GTC/OSIRIS
• Mechanisms for high spin in black-hole neutron-star binaries and kilonova emission: inheritance and accretion
• Searching for Gravitational-Wave Counterparts using the Transiting Exoplanet Survey Satellite
• Early Warning From Eccentric Compact Binaries: Template Initialization And Sub-dominant Mode Effects