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High-energy $gamma$-ray emission from GRBs | | F. De Paolis
; G. Ingrosso
; D. Orlando
; | | Date: |
7 Jun 2000 | | Subject: | astro-ph | | Affiliation: | Univ. of Lecce | | Abstract: | GRBs are nowadays a rather well understood phenomenon in the soft (KeV-MeV) $gamma$-ray energy band, while only a few GRBs have been observed at high photon energies ($E_{gamma} ut > 1$ GeV). It is also widely recognized that GRBs accelerate protons to relativistic energies and that dense media are often present nearby the sources. Within this framework we compute in detail the high-energy $gamma$-ray flux from the decay of neutral pions produced through the interaction of accelerate protons with nucleons in the surrounding medium. We also take into account the local and intergalactic $gamma$-ray absorption. The presence of magnetic fields around the GRB sources causes the deflection of the accelerated protons and so a temporal spread of the produced high-energy $gamma$-rays with respect to the signal in the soft $gamma$-ray band. Moreover, we analyze the possibility to detect the $gamma$-ray signal in the GeV-TeV energy range by the ARGO detector under construction in Tibet. | | Source: | arXiv, astro-ph/0006095 | | Services: | Forum | Review | PDF | Favorites | |
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