Author: Remo Ruffini
Abstract: A clear differentiation between short and long GRB has been proposed as a function of the baryon load of the GRB sources, following the fireshell model [Ruffini et al. 2001, ApJ, 555, L207, L 113, L117].
Such a classification has been confirmed by the observation of GRB 090227B presented by Muccino et al. 2013, ApJ., 763, 125M. The concept of induced gravitational collapse originally presented in Ruffini et al. 2001, ApJ, 555, L117 has been recently evolved and a new observational evidence has been obtained (GRB 090618 and GRB 101023). The presence of unexpected scaling laws [Pisani et al, submitted] opens new frontiers for a deeper understanding of a GRB-SN system and their use as cosmological tests.