Physics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..921..268g&link_type=abstract
THE FIRST GLAST SYMPOSIUM. AIP Conference Proceedings, Volume 921, pp. 268-270 (2007).
Physics
Gamma-Ray Sources, Gamma-Ray Bursts, Gamma-Ray, X-Ray Sources, X-Ray Bursts, X-Ray
Scientific paper
We estimate the GeV emission from GRB during the External Shock phase of the fireball. We study in detail how the relative importance of synchrotron and Inverse Compton emission varies with the parameters of the External Shock model in different radiative regimes. We first assess the high energy emission expected for a typical afterglow. This high energy emission could explain the delayed GeV emission detected by EGRET in GRB 940217. We then present a study of Gamma-Ray Burst flare activity, which has an important role to understand the physics of the progenitor. In the framework of External Shock the emission mechanism responsible for X-ray flares is synchrotron and the X-ray flare photons are expected to interact with the forward shock electrons by Inverse Compton thus producing flares in the GeV band. In our scenario X-ray and high energy flares are produced by the same emitting region and electrons population, thus one expect that the two flares have similar temporal profiles and no significant delay. The advantage of simultaneous X-ray and high energy observations during the SWIFT-GLAST era play an important role to discriminate between Internal and External Shock models.
Galli Alessandra
Piro Luigi
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