Synthetic light curves of GRB980425 A) (Ruffini et al. 2004; Fraschetti et al. 2005; Bernardini et al. 2008), GRB030329 B) (Bernardini et al. 2004, 2005b) and GRB031203 C) (Bernardini et al. 2005a; Ruffini et al. 2007a, 2008). The solid curves represent the hard X-ray emission (10–200 keV range) and the triangles are 2–10 keV flux points. The optical luminosities of the SNe accompanying these GRBs are also reported with crosses (see Ruffini et al. 2007a, for details). The curves fitting the late X-ray luminosity (URCAs) are qualitative cooling curves based on Canuto (1978); see also Ruffini et al. (2004, 2007a, 2008), Bernardini et al. (2004, 2005a,b, 2008), and Fraschetti et al. (2005) for details.