5 Conclusions

The results of this study of BATSE light curve of GRBs are presented. The analysis revealed that the running light curve of a minority of bursts increase or decrease approximately linearly with time. These results are interpreted as possible evidence for spin-up and spin-down of black holes during the burst. The BZ process and neutrino annihilation are consistent with these results. The brute force appearance of Kerr black holes being spun up an down by hyperaccretion in GRBs contrasts with the more sedate and longer lasting indications of black holes in MCG-6-30-15 and other sources (Wilms et al. 2001; Miller et al. 2002; Woo & Urry 2002; Koide et al. 2002).