Corsi 2009 GRB 081024B的GeV辐射的解释

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Title:		GeV emission from short Gamma-Ray Bursts: the case of GRB 081024B
Authors:		Corsi, Alessandra; Guetta, Dafne; Piro, Luigi
Publication:		eprint arXiv:0905.1513
Publication Date:		05/2009
Origin:		ARXIV
Keywords:		Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		7 pages, 3 color figures, submitted to Astronomy and Astrophysics
Bibliographic Code:		2009arXiv0905.1513C

Abstract

We investigate the origin of the high energy tail detected by Fermi/LAT in the short GRB 081024B through synchrotron and self-Compton emission in either the internal or external shock models. In the internal shock scenario, we explore the possibility of generating the high energy photons directly through synchrotron process, or through inverse Compton emission in which target photons are synchrotron photons produced in internal shocks taking place either in the short prompt phase, or in a lately emitted shell (delayed internal shocks). In the external shock scenario, we consider the possibility of the high energy tail being the extension of the afterglow synchrotron emission, or alternatively the inverse Compton component associated to the afterglow synchrotron photons. For the internal shock scenario we conclude that, given the constraints set by the observations on the prompt emission spectrum, only an inverse Compton component from delayed internal shocks can accommodate the presence of a high energy tail extended up to the GeV range. In the external shock scenario, we show that interpreting the high energy tail as synchrotron-only afterglow emission, implies a bright late-time afterglow which was not observed by Swift. On the other hand, the observed high energy tail is consistent with an inverse Compton component of the afterglow, powered by a fireball with isotropic energy of the order of 10^{51} ergs, expanding in a uniform medium with density n \sim 5 particles/cm^{3}.

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