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High-energy -ray emission from gamma-ray bursts

GRBs are nowadays a rather well understood phe- nomenon in the soft (KeV-MeV)-ray energy band, while only a few GRBs have been observed at high photon energies (E> 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 and by further adopt- ing Totani's suggestion that GRB events release an amount of energy 10 54 erg, we compute in detail the high-energy- ray flux from the decay of neutral pions produced through the in- teraction of accelerate protons with nucleons in the surrounding medium. We also take into account the local and intergalactic -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 -rays with respect to the signal in the soft -ray band. Moreover, we analyze the possibility to detect the -ray signal in the GeV-TeV energy range by the ARGO detector under construction in Tibet.