The Broad-band Counterpart of the Short GRB 200522A at $z=0.5536$: A Luminous Kilonova or a Collimated Outflow with a Reverse Shock?

Abstract

We present the discovery of the radio afterglow and near-infrared (NIR) counterpart of the Swift short GRB 200522A, located at a small projected offset of $\approx 1$ kpc from the center of a young, star-forming host galaxy at $z=0.5536$. The radio and X-ray luminosities of the afterglow are consistent with those of on-axis cosmological short GRBs. The NIR counterpart, revealed by our HST observations at a rest-frame time of $\approx 2.3$ days, has a luminosity of $\approx (1.3-1.7)\times 10^{42}$ erg s${}^{-1}$. This is substantially lower than on-axis short GRB afterglow detections, but is a factor of $\approx 8$-$17$ more luminous than the kilonova of GW170817, and significantly more luminous than any kilonova candidate for which comparable observations exist. The combination of the counterpart's color ($i-y=-0.08\pm 0.21$; rest-frame) and luminosity cannot be explained by standard radioactive heating alone. We present two scenarios to interpret the broad-band behavior of GRB 200522A: a synchrotron forward shock with a luminous kilonova (potentially boosted by magnetar energy deposition), or forward and reverse shocks from a $\approx 14^{\circ }$, relativistic (${\Gamma }_0\gtrsim 80$) jet. Models which include a combination of enhanced radioactive heating rates, low-lanthanide mass fractions, or additional sources of heating from late-time central engine activity may provide viable alternate explanations. If a stable magnetar was indeed produced in GRB 200522A, we predict that late-time radio emission will be detectable starting $\approx 0.3$-$6$ years after the burst for a deposited energy of $\approx 10^{53}$ erg. Counterparts of similar luminosity to GRB 200522A associated with gravitational wave events will be detectable with current optical searches to $\approx 250$ Mpc.

arXiv comment33 pages, 13 figures, 5 tables. Submitted to AAS Journals

References in corpus (189)

• The chemical composition of the Sun
• Galactic Stellar and Substellar Initial Mass Function
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• Star Formation in Galaxies Along the Hubble Sequence
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• On the Absorption of X-rays in the Interstellar Medium
• Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
• LSST: from Science Drivers to Reference Design and Anticipated Data Products
• The Spitzer Space Telescope Mission
• The Eleventh and Twelfth Data Releases of the Sloan Digital Sky Survey: Final Data from SDSS-III
• Spectra and Light Curves of Gamma-Ray Burst Afterglows
• dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
• Atomic Data for Astrophysics. II. New Analytic Fits for Photoionization Cross Sections of Atoms and Ions
• The propagation of uncertainties in stellar population synthesis modeling I: The relevance of uncertain aspects of stellar evolution and the IMF to the derived physical properties of galaxies
• Methods and results of an automatic analysis of a complete sample of Swift-XRT observations of GRBs
• Metallicity Calibrations and the Mass-Metallicity Relation for Star-Forming Galaxies
• Gamma-Ray Bursts as the Death Throes of Massive Binary Stars
• Transient Events from Neutron Star Mergers
• Origin of the heavy elements in binary neutron-star mergers from a gravitational wave event
• Optical and Long Wavelength Afterglow from Gamma-Ray Bursts
• Electromagnetic Counterparts of Compact Object Mergers Powered by the Radioactive Decay of R-process Nuclei
• Swope Supernova Survey 2017a (SSS17a), the Optical Counterpart to a Gravitational Wave Source
• The propagation of uncertainties in stellar population synthesis modeling III: model calibration, comparison, and evaluation
• Short-Duration Gamma-Ray Bursts
• Jets in GRBs
• 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
• Modeling the Panchromatic Spectral Energy Distributions of Galaxies
• An online repository of Swift/XRT light curves of GRBs
• The X-ray counterpart to the gravitational wave event GW 170817
• A kilonova as the electromagnetic counterpart to a gravitational-wave source
• Constraining the Low-Mass Slope of the Star Formation Sequence at 0.5<z<2.5
• Short-Hard Gamma-Ray Bursts
• Long gamma-ray bursts and core-collapse supernovae have different environments
• 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
• Calibration of X-ray absorption in our Galaxy
• The Emergence of a Lanthanide-Rich Kilonova Following the Merger of Two Neutron Stars
• A "kilonova" associated with short-duration gamma-ray burst 130603B
• The Fifth Data Release of the Sloan Digital Sky Survey
• The Shape of Spectral Breaks in GRB Afterglows
• The Observed Offset Distribution of Gamma-Ray Bursts from Their Host Galaxies: A Robust Clue to the Nature of the Progenitors
• Production of all the r-process nuclides in the dynamical ejecta of neutron star mergers
• Optical emission from a kilonova following a gravitational-wave-detected neutron-star merger
• On the astrophysical robustness of neutron star merger r-process
• Effect of a High Opacity on the Light Curves of Radioactively Powered Transients from Compact Object Mergers
• 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
• Opacities and Spectra of the r-process Ejecta from Neutron Star Mergers
• 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
• Swift detects a remarkable gamma-ray burst, GRB 060614, that introduces a new classification scheme
• A Decade of Short-duration Gamma-ray Burst Broad-band Afterglows: Energetics, Circumburst Densities, and Jet Opening Angles
• Predictions for The Very Early Afterglow and The Optical Flash
• Deriving Physical Properties from Broadband Photometry with Prospector: Description of the Model and a Demonstration of its Accuracy Using 129 Galaxies in the Local Universe
• On The Synchrotron Self-Compton Emission from Relativistic Shocks and Its Implications for Gamma-Ray Burst Afterglows
• 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
• An r-Process Kilonova Associated with the Short-Hard GRB 130603B
• The Gemini Deep Deep Survey. VII. The Redshift Evolution of the Mass-Metallicity Relation
• Neutrino-driven winds from neutron star merger remnants
• Radiative Transfer Simulations for Neutron Star Merger Ejecta
• Kilonovae
• The discovery of the electromagnetic counterpart of GW170817: kilonova AT 2017gfo/DLT17ck
• No supernovae associated with two long-duration gamma ray bursts
• The 1% Concordance Hubble Constant
• Particle Acceleration in Relativistic Magnetized Collisionless Electron-Ion Shocks
• Red or blue? A potential kilonova imprint of the delay until black hole formation following a neutron star merger
• Radio Remnants of Compact Binary Mergers - the Electromagnetic Signal that will follow the Gravitational Waves
• The DEEP2 Galaxy Redshift Survey: The Galaxy Luminosity Function to z ~ 1
• Refreshed Shocks and Afterglow Longevity in GRB
• The afterglow and elliptical host galaxy of the short gamma-ray burst GRB 050724
• Time Dependent Monte Carlo Radiative Transfer Calculations For 3-Dimensional Supernova Spectra, Lightcurves, and Polarization
• Neutrino signatures and the neutrino-driven wind in Binary Neutron Star Mergers
• The Third Swift Burst Alert Telescope Gamma-Ray Burst Catalog
• The Binary Neutron Star event LIGO/VIRGO GW170817 a hundred and sixty days after merger: synchrotron emission across the electromagnetic spectrum
• Hydrodynamic Time Scales and Temporal Structure of GRBs
• Radioactivity and thermalization in the ejecta of compact object mergers and their impact on kilonova light curves
• Kilonova Light Curves from the Disk Wind Outflows of Compact Object Mergers
• The dynamical mass ejection from binary neutron star mergers: Radiation-hydrodynamics study in general relativity
• The Locations of Short Gamma-ray Bursts as Evidence for Compact Object Binary Progenitors
• Optical Star-Formation Rate Indicators
• Light Curves of GRB Optical Flashes
• A possible Macronova in the late afterglow of the `long-short' burst GRB 060614
• New fully empirical calibrations of strong-line metallicity indicators in star forming galaxies
• A Study of Compact Object Mergers as Short Gamma-ray Burst Progenitors
• Optical and X-ray emission from stable millisecond magnetars formed from the merger of binary neutron stars
• The Hubble Space Telescope Wide Field Camera 3 Early Release Science data: Panchromatic Faint Object Counts for 0.2-2 microns wavelength
• The Afterglow, Energetics and Host Galaxy of the Short-Hard Gamma-Ray Burst 051221a
• Electromagnetic Evidence that SSS17a is the Result of a Binary Neutron Star Merger
• MASTER optical detection of the first LIGO/Virgo neutron stars merging GW170817
• Resonant Shattering of Neutron Star Crusts
• Bright "merger-nova" from the remnant of a neutron star binary merger: A signature of a newly born, massive, millisecond magnetar
• Systematic Opacity Calculations for Kilonovae
• A Study of the Afterglows of Four GRBs: Constraining the Explosion and Fireball Model
• The unusual X-ray emission of the short Swift GRB 090515: Evidence for the formation of a magnetar?
• Global simulations of strongly magnetized remnant massive neutron stars formed in binary neutron star mergers
• Hubble Space Telescope Observations of Short GRB Host Galaxies: Morphologies, Offsets, and Local Environments
• Klein-Nishina Effects on Optically Thin Synchrotron and Synchrotron Self-Compton Spectrum
• The Afterglow of GRB 130427A from 1 to 10^16 GHz
• Impact of ejecta morphology and composition on the electromagnetic signatures of neutron star mergers
• The Macronova in GRB 050709 and the GRB/macronova connection
• Testing LMC Microlensing Scenarios: The Discrimination Power of the SuperMACHO Microlensing Survey
• Follow up of GW170817 and its electromagnetic counterpart by Australian-led observing programs
• A magnetar origin for the kilonova ejecta in GW170817
• Demographics of the Galaxies Hosting Short-duration Gamma-Ray Bursts
• J-GEM observations of an electromagnetic counterpart to the neutron star merger GW170817
• A Decline in the X-ray through Radio Emission from GW170817 Continues to Support an Off-Axis Structured Jet
• Direct measurements of dust attenuation in z~1.5 star-forming galaxies from 3D-HST: Implications for dust geometry and star formation rates
• Signatures of hypermassive neutron star lifetimes on r-process nucleosynthesis in the disk ejecta from neutron star mergers
• Afterglow Observations of Fermi-LAT Gamma-Ray Bursts and the Emerging Class of Hyper-Energetic Events
• Short GRB 130603B: Discovery of a jet break in the optical and radio afterglows, and a mysterious late-time X-ray excess
• Full Transport Model of GW170817-Like Disk Produces a Blue Kilonova
• Magnetorotational instability in relativistic hypermassive neutron stars
• Precursors of short gamma-ray bursts
• Optical Flashes and Radio Flares in GRBs afterglow: Numerical Study
• A Short GRB "No-Host'' Problem? Investigating Large Progenitor Offsets for Short GRBs with Optical Afterglows
• A turnover in the radio light curve of GW170817
• Detectability of compact binary merger macronovae
• Short GRB 160821B: a reverse shock, a refreshed shock, and a well-sampled kilonova
• A Comparison of the Afterglows of Short- and Long-Duration Gamma-Ray Bursts
• The Collimation and Energetics of the Brightest Swift Gamma-Ray Bursts
• Mass ejection from neutron star mergers: different components and expected radio signals
• Necessary Conditions for Short Gamma-Ray Burst Production in Binary Neutron Star Mergers
• Observations of the first electromagnetic counterpart to a gravitational wave source by the TOROS collaboration
• A Reverse Shock in GRB 130427A
• Discovery of a Radio Flare from GRB 990123
• The afterglow and kilonova of the short GRB 160821B
• Diversity of kilonova light curves
• The Stellar Ages and Masses of Short GRB Host Galaxies: Investigating the Progenitor Delay Time Distribution and the Role of Mass and Star Formation in the Short GRB Rate
• A luminous blue kilonova and an off-axis jet from a compact binary merger at z=0.1341
• Setting UBVRI Photometric Zero-Points Using Sloan Digital Sky Survey ugriz Magnitudes
• Radioactively Powered Emission from Black Hole-Neutron Star Mergers
• The Multi-Messenger Matrix: the Future of Neutron Star Merger Constraints on the Nuclear Equation of State
• A magnetar engine for short GRBs and kilonovae
• The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. VIII. A Comparison to Cosmological Short-duration Gamma-ray Bursts
• Correlations of Prompt and Afterglow Emission in Swift Long and Short Gamma Ray Bursts
• Short GRBs: opening angles, local neutron star merger rate and off-axis events for GRB/GW association
• Jet Breaks in Short Gamma-Ray Bursts. I: The Uncollimated Afterglow of GRB 050724
• Accurate early positions for Swift GRBS: enhancing X-ray positions with UVOT astrometry
• Demographics of Star-forming Galaxies since $z\sim 2.5$. I. The $UVJ$ Diagram in CANDELS
• An achromatic break in the afterglow of the short GRB 140903A: evidence for a narrow jet
• Follow-up of the Neutron Star Bearing Gravitational Wave Candidate Events S190425z and S190426c with MMT and SOAR
• Optical Observations of LIGO Source GW 170817 by the Antarctic Survey Telescopes at Dome A, Antarctica
• On the nature of the 'hostless' short GRBs
• Discovery of the afterglow and host galaxy of the low redshift short GRB 080905A
• The Diversity of Kilonova Emission in Short Gamma-Ray Bursts
• Energy Injection in Gamma-ray Burst Afterglows
• Collimated outflows from long-lived binary neutron star merger remnants
• Dust Attenuation, Star Formation, and Metallicity in z ~ 2-3 Galaxies from KBSS-MOSFIRE
• The Afterglow and Early-Type Host Galaxy of the Short GRB 150101B at z=0.1343
• A comparison between short GRB afterglows and AT2017gfo: shedding light on kilonovae properties
• The Spitzer-HETDEX Exploratory Large-Area Survey
• Constraints on long-lived remnants of neutron star binary mergers from late-time radio observations of short duration gamma-ray bursts
• A luminosity distribution for kilonovae based on short gamma-ray burst afterglows
• GRB 120521C at z~6 and the Properties of High-redshift GRBs
• A Reverse Shock in GRB 160509A
• Connecting the progenitors, pre-explosion variability, and giant outbursts of luminous blue variables with Gaia16cfr
• Radioactive Heating and Late Time Kilonova Light Curves
• The Energetics and Environment of the Short-GRB Afterglows 050709 and 050724
• Testing the Magnetar Model via Late Time Radio Observations of Two Macronova Candidates
• Observational Prospects for Afterglows of Short Duration Gamma-ray Bursts
• Deducing the Lifetime of Short Gamma-Ray Burst Progenitors from Host Galaxy Demography
• ALMA Detection of a Linearly Polarized Reverse Shock in GRB 190114C
• Searches After Gravitational-waves Using ARizona Observatories (SAGUARO): System Overview and First Results from Advanced LIGO/Virgo's Third Observing Run
• Radio Constraints on Long-Lived Magnetar Remnants in Short Gamma-Ray Bursts
• How to switch on and off a Gamma-ray burst through a magnetar
• Energy Injection Episodes in Gamma Ray Bursts: The Light Curves and Polarization Properties of GRB 021004
• Constraints on the emitting region of the gamma-rays observed in GW170817
• A Reverse Shock in GRB 181201A
• A Reverse Shock and Unusual Radio Properties in GRB 160625B
• SpIES: The Spitzer IRAC Equatorial Survey
• First ALMA Light Curve Constrains Refreshed Reverse Shocks and Jet Magnetization in GRB 161219B
• The Afterglow and ULIRG Host Galaxy of the Dark Short GRB 120804A
• Constraints on the circumburst environments of short gamma-ray bursts
• X-ray-powered macronovae
• A Late-time Radio Survey of Short GRBs at $z<0.5$: New Constraints on the Remnants of Neutron Star Mergers
• Energy Sources and Light Curves of Macronovae
• Analytic heating rate of neutron star merger ejecta derived from Fermi's theory of beta decay
• Magnetization Degree of Gamma-Ray Burst Fireballs: Numerical Study
• Is the macronova in GW170817 powered by the central engine?
• Precursor flares of short gamma-ray bursts from crust yielding due to tidal resonances in coalescing binaries of rotating, magnetized neutron stars
• Are short gamma-ray bursts collimated? GRB050709, a flare but no break
• A VLA Study of High-redshift GRBs II - The Complex Radio Afterglow of GRB 140304A: Shell Collisions and Two Reverse Shocks
• Discovery of the optical afterglow and host galaxy of short GRB181123B at $z=1.754$: Implications for Delay Time Distributions
• Reverse Shock Emission Revealed in Early Photometry in the Candidate Short GRB 180418A
• Constraining the long-lived magnetar remnants in short gamma-ray bursts from late-time radio observations
• The distant, galaxy cluster environment of the short GRB 161104A at $z\sim 0.8$ and a comparison to the short GRB host population
• Exploring the chemical link between local ellipticals and their high-redshift progenitors
• The Location and Environments of Neutron Star Mergers in an Evolving Universe
• Cooling off with a kilonova - Lower Limit on the Expansion Velocity of GW170817
• Deep ATCA and VLA radio observations of short-GRB host galaxies. Constraints on star-formation rates, afterglow flux, and kilonova radio flares

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