Black Holes in Gamma Ray Bursts

Within the fireshell model, Gamma Ray Bursts (GRBs) originate from an optically thick e± plasma created by vacuum polarization process during the formation of a Black Hole (BH). Here we briefly recall the basic features of this model, then we show how it is possible to interpret GRB observational properties within it. In particular we present, as a specific example, the analysis of GRB 050904 observations of the prompt emission light curve and spectrum in the Swift BAT energy band (15–150 keV).