GRB 201015A and the nature of low-luminosity soft gamma-ray bursts

Abstract

GRB 201015A is a peculiarly low luminosity, spectrally soft gamma-ray burst (GRB), with $T_{90}=9.8\pm 3.5$ s (time interval of detection of 90\% of photons from the GRB), and an associated supernova (likely to be type Ic or Ic-BL). GRB 201015A has an isotropic energy $E_{\gamma ,\mathrm{iso}}=1.75_{-0.53}^{+0.60}\times 10^{50}$ erg, and photon index $\Gamma =3.00_{-0.42}^{+0.50}$ (15-150 keV). It follows the Amati relation, a correlation between $E_{\gamma ,\mathrm{iso}}$ and spectral peak energy $E_{\mathrm{p}}$ followed by long GRBs. It appears exceptionally soft based on $\Gamma$, the hardness ratio of HR = $0.47\pm 0.24$, and low-$E_{\mathrm{p}}$, so we have compared it to other GRBs sharing these properties. These events can be explained by shock breakout, poorly collimated jets, and off-axis viewing. Follow-up observations of the afterglow taken in the X-ray, optical, and radio, reveal a surprisingly late flattening in the X-ray from $t=(2.61\pm 1.27)\times 10^4$ s to $t=1.67_{-0.65}^{+1.14}\times 10^6$ s. We fit the data to closure relations describing the synchrotron emission, finding the electron spectral index to be $p=2.42_{-0.30}^{+0.44}$, and evidence of late-time energy injection with coefficient $q=0.24_{-0.18}^{+0.24}$. The jet half opening angle lower limit (${\theta }_j\ge 16^{\circ }$) is inferred from the non-detection of a jet break. The launch of SVOM and Einstein Probe in 2023, should enable detection of more low luminosity events like this, providing a fuller picture of the variety of GRBs.

arXiv comment15 pages, 4 figures

References in corpus (93)

• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• 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
• Spectra and Light Curves of Gamma-Ray Burst Afterglows
• The Physics of Gamma-Ray Bursts
• Methods and results of an automatic analysis of a complete sample of Swift-XRT observations of GRBs
• The Fermi Gamma-Ray Burst Monitor
• The Burst Alert Telescope (BAT) on the Swift MIDEX Mission
• A very energetic supernova associated with the gamma-ray burst of 29 March 2003
• Intrinsic spectra and energetics of BeppoSAX Gamma-Ray Bursts with known redshifts
• Spectroscopic Discovery of the Supernova 2003dh Associated with GRB 030329
• Physical processes shaping GRB X-ray afterglow lightcurves: theoretical implications from the Swift XRT observations
• Astrometry.net: Blind astrometric calibration of arbitrary astronomical images
• Jets in GRBs
• An online repository of Swift/XRT light curves of GRBs
• Evidence for a Canonical GRB Afterglow Light Curve in the Swift/XRT Data
• The X-ray counterpart to the gravitational wave event GW 170817
• Long gamma-ray bursts and core-collapse supernovae have different environments
• Calibration of X-ray absorption in our Galaxy
• Gamma-Ray Bursts: Progress, Problems & Prospects
• The shock break-out of GRB 060218/SN 2006aj
• A "kilonova" associated with short-duration gamma-ray burst 130603B
• Gamma-ray Burst Afterglow with Continuous Energy Injection: Signature of a Highly-Magnetized Millisecond Pulsar
• Theories of Gamma-Ray Bursts
• Swift detects a remarkable gamma-ray burst, GRB 060614, that introduces a new classification scheme
• Bright X-ray Flares in Gamma-Ray Burst Afterglows
• The Ep,i - Eiso correlation in GRBs: updated observational status, re-analysis and main implications
• Short Gamma-Ray Bursts with Extended Emission
• A Kilonova Following a Long-Duration Gamma-Ray Burst at 350 Mpc
• The Third Swift Burst Alert Telescope Gamma-Ray Burst Catalog
• Gamma-Ray Burst Environments and Progenitors
• Bolometric light curves and explosion parameters of 38 stripped-envelope core-collapse supernovae
• Low Luminosity Gamma-Ray Bursts as a Unique Population: Luminosity Function, Local Rate, and Beaming Factor
• Jet breaks and Energetics of Swift GRB X-ray Afterglows
• Three types of gamma-ray bursts
• A very luminous magnetar-powered supernova associated with an ultra-long gamma-ray burst
• A new population of ultra-long duration gamma-ray bursts
• The ATLAS All-Sky Stellar Reference Catalog
• A Complete Reference of the Analytical Synchrotron External Shock Models of Gamma-Ray Bursts
• The Millisecond Magnetar Central Engine in short GRBs
• The central engine of gamma-ray bursters
• Discovery of the nearby long, soft GRB 100316D with an associated supernova
• Master Robotic Net
• Short GRB 130603B: Discovery of a jet break in the optical and radio afterglows, and a mysterious late-time X-ray excess
• The Swift Burst Analyser I: BAT and XRT spectral and flux evolution of Gamma Ray Bursts
• Early-time light curves of Type Ib/c supernovae from the SDSS-II Supernova Survey
• The prompt-afterglow connection in Gamma-Ray Bursts: a comprehensive statistical analysis of Swift X-ray light-curves
• Hyper-accreting black hole as GRB central engine. I: Baryon loading in GRB jets
• Short GRB 160821B: a reverse shock, a refreshed shock, and a well-sampled kilonova
• A unified picture for low-luminosity and long gamma-ray bursts based on the extended progenitor of llgrb 060218/SN 2006aj
• Investigating the properties of stripped-envelope supernovae, what are the implications for their progenitors?
• The Ep,i - Eiso correlation: type I gamma-ray bursts and the new classification method
• Threshold for Extended Emission in Short Gamma-Ray Bursts
• A luminous blue kilonova and an off-axis jet from a compact binary merger at z=0.1341
• Low-Luminosity Gamma-Ray Bursts as a Distinct GRB Population:A Firmer Case from Multiple Criteria Constraints
• GRB 120422A/SN 2012bz: Bridging the Gap between Low- And High-Luminosity GRBs
• A complete sample of bright Swift short Gamma-Ray Bursts
• Short GRB Host Galaxies I: Photometric and Spectroscopic Catalogs, Host Associations, and Galactocentric Offsets
• Bright broad-band afterglows of gravitational wave bursts from mergers of binary neutron stars
• A Redshift Determination for XRF 020903: First Spectroscopic Observations of an X-Ray Flash
• Correlations of Prompt and Afterglow Emission in Swift Long and Short Gamma Ray Bursts
• Bolometric Corrections for optical light curves of Core-collapse Supernovae
• The Fermi GBM gamma-ray burst time-resolved spectral catalog: brightest bursts in the first four years
• Accurate early positions for Swift GRBS: enhancing X-ray positions with UVOT astrometry
• The case for a minute-long merger-driven gamma-ray burst from fast-cooling synchrotron emission
• A Peculiarly Short-duration Gamma-Ray Burst from Massive Star Core Collapse
• Gamma-ray burst progenitors
• Statistical Study of Gamma-Ray Bursts with a Plateau Phase in the X-ray Afterglow
• X-ray Plateaus in Gamma Ray Bursts' light-curves from jets viewed slightly off-axis
• Luminosity--time and luminosity--luminosity correlations for GRB prompt and afterglow plateau emissions
• A Study of the Gamma-Ray Burst Fundamental Plane
• Electrons' energy in GRB afterglows implied by radio peaks
• Constraining the Type of Central Engine of GRBs with Swift Data
• A Search for Neutron Star-Black Hole Binary Mergers in the Short Gamma-Ray Burst Population
• Photometric selection of Type Ia supernovae in the Supernova Legacy Survey
• An Unambiguous Separation of Gamma-Ray Bursts into Two Classes from Prompt Emission Alone
• The X-ray light curve of Gamma-ray bursts: clues to the central engine
• Jet or Shock Breakout? The Low-Luminosity GRB 060218
• Signature of a New-Born Black Hole from the Collapse of a Supra-massive Millisecond Magnetar
• High-energy emission from Gamma-Ray Bursts
• GRB jet structure and the jet break
• Off-axis jet scenario for early afterglow emission of low-luminosity gamma-ray burst GRB 190829A
• Synchrotron emission in GRBs observed by Fermi: Its limitations and the role of the photosphere
• The Environments of the Most Energetic Gamma-Ray Bursts
• GRB 170817A as a Refreshed Shock Afterglow viewed off-axis
• Inverse Compton Signatures of Gamma-Ray Burst Afterglows
• Revisiting the Redshift Distribution of Gamma Ray Bursts in the Swift Era
• GRB Observational Properties
• On Spectral Peak Energy of Swift Gamma-Ray Bursts
• Gamma-Ray Bursts with Extended Emission: Classifications, Energy Correlations and Radiation Properties
• Gamma-Ray Bursts: To be Short or Long is not the Question
• VLBI observations of GRB 201015A, a relatively faint GRB with a hint of Very High Energy gamma-ray emission
• ALMA Host galaxy observation of the off-axis Gamma-Ray Burst XRF020903

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