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Title: GRB 131231A: IMPLICATIONS OF THE GeV EMISSION

GRB 131231A was detected by the Large Area Telescope on board the Fermi Space Gamma-ray Telescope. The high-energy gamma-ray (>100 MeV) afterglow emission spectrum is F {sub ν}∝ν{sup –0.54} {sup ±} {sup 0.15} in the first ∼1300 s after the trigger and the most energetic photon has an energy of ∼62 GeV, arriving at t ∼ 520 s. With reasonable parameters of the gamma-ray burst (GRB) outflow as well as the density of the circum-burst medium, the synchrotron radiation of electrons or protons accelerated at an external forward shock have difficulty accounting for the data. Rather, the synchrotron self-Compton radiation of the forward shock-accelerated electrons can account for both the spectrum and temporal behavior of the GeV afterglow emission. We also show that the prospect for detecting GRB 131231A-like GRBs with the Cherenkov Telescope Array is promising.
Authors:
; ; ; ; ; ; ;  [1] ;  [2] ;  [3]
  1. Key laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China)
  2. Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan (China)
  3. Department of Physics, Hebei Normal University, Shijiazhuang 050024 (China)
Publication Date:
OSTI Identifier:
22365843
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 787; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AFTERGLOW; COSMIC ELECTRONS; COSMIC GAMMA BURSTS; COSMIC PROTONS; EMISSION SPECTRA; GAMMA RADIATION; GEV RANGE; MEV RANGE; SPACE; SYNCHROTRON RADIATION; TELESCOPES