On the origin of GeV emission in gamma-ray bursts

Nava, L. and Ghisellini, G. and Ghirlanda, G. (2011) On the origin of GeV emission in gamma-ray bursts. Il nuovo cimento C, 34 (3). pp. 267-270. ISSN 1826-9885

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We present spectral and temporal analysis of the Fermi-LAT data for 11 gamma-ray bursts detected in the 100MeV–100 GeV energy range. This analysis reveals that some features are common to all bursts, both in the spectral and temporal domain. In particular, i) spectra are consistent with F(E) proportional to E−1 and do not much evolve in time and ii) the light curves decay in times as t−1.5 and, at least in the 50% of cases, present an initial peak. Supported by our results, we suggest that the flux above 100MeV has the same origin as the afterglow emission detected in the X-ray and in the optical and radio bands. We then interpret it as forward shock emission produced by a radiative fireball expanding in the external environment.

Item Type: Article
Uncontrolled Keywords: γ-ray sources; γ-ray bursts
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 06 Apr 2020 18:49
Last Modified: 06 Apr 2020 18:49
URI: http://eprints.bice.rm.cnr.it/id/eprint/17282

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