GeV Emission from Prompt and Afterglow Phases of Gamma-Ray Bursts
| dc.creator | Ando, Shin'ichiro | |
| dc.creator | Nakar, Ehud | |
| dc.creator | Sari, Re'em | |
| dc.date | 2008-06-30 | |
| dc.date | 2008-08-11 | |
| dc.date.accessioned | 2026-07-07T12:05:52Z | |
| dc.date.available | 2026-07-07T12:05:52Z | |
| dc.description | We investigate the GeV emission from gamma-ray bursts (GRBs), using the results from the Energetic Gamma Ray Experimental Telescope (EGRET), and in view of the Gamma-ray Large Area Space Telescope (GLAST). Assuming that the conventional prompt and afterglow photons originate from synchrotron radiation, we compare an accompanying inverse-Compton component with EGRET measurements and upper limits on GeV fluence, taking Klein-Nishina feedback into account. We find that EGRET constraints are consistent with the theoretical framework of the synchrotron self-Compton model for both prompt and afterglow phases, and discuss constraints on microphysical parameters in both phases. Based on the inverse-Compton model and using EGRET results, we predict that GLAST would detect GRBs with GeV photons at a rate >~20 yr^{-1} from each of the prompt and afterglow phases. This rate applies to the high-energy tail of the prompt synchrotron emission and to the inverse-Compton component of the afterglow. Theory predicts that in a large fraction of the cases where synchrotron GeV prompt emission would be detected by GLAST, inverse-Compton photons should be detected as well at high energies >~10 GeV. Therefore GLAST will enable a more precise test of the high-energy emission mechanism. Finally, we show that the contribution of GRBs to the flux of the extragalactic gamma-ray background measured with EGRET is at least 0.01% and likely around 0.1%. | |
| dc.description | 11 pages, 7 figures; accepted by ApJ | |
| dc.identifier | https://arxiv.org/abs/0807.0012 | |
| dc.identifier | http://arxiv.org/abs/0807.0012 | |
| dc.identifier | Astrophys. J. 689, 1150 (2008) | |
| dc.identifier | doi:10.1086/592486 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/208497 | |
| dc.subject | Astrophysics | |
| dc.title | GeV Emission from Prompt and Afterglow Phases of Gamma-Ray Bursts | |
| dc.type | text |