INFERENCES ON THE ISM STRUCTURE AROUND GRB980425 AND GRB 980425 - SN1998BW ASSOCIATION IN THE EMBH MODEL

摘要

We determine the four free parameters within the EMBH model for GRB 980425 and deduce its luminosity in given energy bands, its spectra and its time variability in the prompt radiation. We compute the basic kinematical parameters of GRB 980425. In the extended afterglow peak emission the Lorentz γ factor is lower than the critical value 150 which has been found in (24) to be necessary in order to perform the tomography of the ISM surrounding. the GRB as suggested by (7). The detailed structure of the density inhomogeneities as well as the effects of radial apparent superluminal effects are evaluated within the EMBH model. Under the assumption that the energy distribution of emitted radiation is thermal in the comoving frame, time integrated spectra of EMBH model for prompt emission are computed. The induced supernova concept is applied to this system and general consequences on the astrophysical and cosmological scenario are derived.