Ando 2008 在瞬时和余辉阶段可能产生的GeV辐射

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· arXiv e-print (arXiv:0807.0012)

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Title:		GeV Emission from Prompt and Afterglow Phases of Gamma-Ray Bursts
Authors:		Ando, Shin'ichiro; Nakar, Ehud; Sari, Re'em
Publication:		eprint arXiv:0807.0012
Publication Date:		06/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		10 pages, 7 figures; submitted to ApJ
Bibliographic Code:		2008arXiv0807.0012A

Abstract

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 forthcoming 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%.

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