The possible high-energy emission from GRB 080319B and origins of the GeV emission of GRBs 080514B, 080916C and 081024B
Abstract
We calculate the high-energy (sub-GeV to TeV) prompt and afterglow emission of GRB 080319B that was distinguished by a naked-eye optical flash and by an unusual strong early X-ray afterglow. There are three possible sources for high-energy emission: the prompt optical and γ-ray photons IC scattered by the accelerated electrons, the prompt photons IC scattered by the early external reverse-forward shock electrons, and the higher band of the synchrotron and the synchrotron self-Compton emission of the external shock. There should have been in total hundreds of high-energy photons detectable for the Large Area Telescope onboard the Fermi satellite, and tens of photons of those with energy >10 GeV. The >10 GeV emission had a duration about twice that of the soft γ-rays. Astro-rivelatore Gamma a Immagini Leggero (AGILE) could have observed these energetic signals if it was not occulted by the Earth at that moment. The physical origins of the high-energy emission detected in GRB 080514B, GRB 080916C and GRB 081024B are also discussed. These observations seem to be consistent with the current high-energy emission models.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- June 2009
- DOI:
- 10.1111/j.1365-2966.2009.14779.x
- arXiv:
- arXiv:0811.2997
- Bibcode:
- 2009MNRAS.396.1163Z
- Keywords:
-
- radiation mechanisms: non-thermal;
- gamma-rays: bursts;
- Astrophysics
- E-Print:
- Accepted for publication in MNRAS, the interpretation of GRB 080916C has been extended, main conclusions are unchanged