In this paper we discuss a possible explanation for the high energy emission (up to ～ GeV) seen in GRB 080916C. We propose that the GeV emission is originated by the collision between relativistic baryons in the fireshell after the transparency and the nucleons located in molecular clouds near the burst site. This collision should give rise pion production, whose immediate decay provides high energy photons, neutrinos and leptons. Using a public code (SYBILL) we simulate these relativistic collisions in their simple form, so that we can draw our preliminar results in this paper. We will present moreover our hypothesis that the delayed onset of this emission identifies in a complete way the P-GRB emission.
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