On the possible origin of gamma ray bursts as a result of interaction of relativistic jets with the soft photon field in dense stellar regions

We examine and develop the model of gamma ray bursts origin proposed by Shaviv and Dar (astro-ph/9606032), according to which the strong gamma ray emission is produced by the interaction of the baryonic relativistic jet (outflow) with the soft photon field in a dense stellar region. It is shown by the simulations of the burst profiles that these profiles are very sensitive to the jet geometry, and the ‘clarity’ of the GRB profile is (in this model) somehow connected with the gamma rays beaming. Also some event-rate based restrictions are derived and discussed.