Fermi-LAT Detection of a GeV Afterglow from a Compact Stellar Merger

Abstract

It is usually thought that long-duration gamma-ray bursts (GRBs) are associated with massive star core collapse, whereas short-duration GRBs are associated with mergers of compact stellar binaries. The discovery of a kilonova associated with a nearby (350 Mpc) long-duration GRB-GRB 211211A, however, indicates that the progenitor of this long-duration GRB is a compact object merger. Here we report the Fermi-LAT detection of gamma-ray ($>100\mathrm{MeV}$) afterglow emission from GRB 211211A, which lasts $\sim$20,000 s after the burst, the longest event for conventional short-duration GRBs ever detected. We suggest that this gamma-ray emission results from afterglow synchrotron emission. The soft spectrum of GeV emission may arise from a limited maximum synchrotron energy of only a few hundreds of MeV at $\sim$20,000 s. The unusually long duration of the GeV emission could be due to the proximity of this GRB and the long deceleration time of the GRB jet that is expanding in a low-density circumburst medium, consistent with the compact stellar merger scenario.

arXiv commentCorrection of a typo

References in corpus (30)

• Multi-messenger Observations of a Binary Neutron Star Merger
• Spectra and Light Curves of Gamma-Ray Burst Afterglows
• Discovery of the peculiar supernova 1998bw in the error box of GRB980425
• 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
• Fermi Large Area Telescope Fourth Source Catalog
• An online repository of Swift/XRT light curves of GRBs
• Swift detects a remarkable gamma-ray burst, GRB 060614, that introduces a new classification scheme
• Fermi Observations of GRB 090902B: A Distinct Spectral Component in the Prompt and Delayed Emission
• The gamma-ray burst GRB060614 requires a novel explosive process
• Swift observations of GRB 070110: an extraordinary X-ray afterglow powered by the central engine
• The First Fermi LAT Gamma-Ray Burst Catalog
• Teraelectronvolt emission from the $\gamma$-ray burst GRB 190114C
• High Energy Spectral Components in Gamma-Ray Burst Afterglows
• External forward shock origin of high energy emission for three GRBs detected by Fermi
• Beaming, Baryon-Loading, and the Synchrotron Self-Compton Component in Gamma-Ray Burst Blast Waves Energized by External Shocks
• Discovery and confirmation of the shortest gamma ray burst from a collapsar
• The onset of the GeV afterglow of GRB 090510
• A Peculiarly Short-duration Gamma-Ray Burst from Massive Star Core Collapse
• On The External Shock Synchrotron Model for GRBs' GeV Emission
• Klein-Nishina effects on the high-energy afterglow emission of gamma-ray bursts
• Synchrotron self-Compton emission from external shocks as the origin of the sub-TeV emission in GRB 180720B and GRB 190114C
• On the High Energy Emission of the Short GRB 090510
• Interpretation of the unprecedentedly long-lived high-energy emission of GRB 130427A
• On the origin of >10 GeV photons in gamma-ray burst afterglows
• Implications of electron acceleration for high-energy radiation from gamma-ray bursts
• GRB afterglow parameters in the era of TeV observations: the case of GRB~190114C
• On particle acceleration rate in GRB afterglows
• Diversity Of Short Gamma-Ray Burst Afterglows From Compact Binary Mergers Hosting Pulsars

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• The case for a minute-long merger-driven gamma-ray burst from fast-cooling synchrotron emission
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• Long-duration Gamma-ray Burst and Associated Kilonova Emission from Fast-spinning Black Hole--Neutron Star Mergers
• GRB 211211A: a Neutron Star$-$White Dwarf Merger?
• Eighteen Years of Kilonova Discoveries with Swift
• GRB 211211A-like Events and How Gravitational Waves May Tell Their Origins
• Evidence for a compact stellar merger origin for GRB 230307A from Fermi-LAT and multi-wavelength afterglow observations
• High-energy neutrino emission associated with gravitational-wave signals: effects of cocoon photons and constraints on late-time emission
• Shared Properties of Merger-driven Long-duration Gamma-Ray Bursts
• Gravitational waves associated with the r-mode instability from neutron star-white dwarf mergers
• Searching for gravitational waves from compact binary mergers powering long gamma-ray bursts during LIGO-Virgo-KAGRA's O3 run