TITLE: GCN CIRCULAR NUMBER: 7799 SUBJECT: GRB 080603B: TAROT Calern observatory confirmation of slow optical decay DATE: 08/06/04 00:41:39 GMT FROM: Alain Klotz at CESR-CNRS Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report: We imaged the field of GRB 080603B from 68 min to 240 min after the trigger with TAROT. The light curve displays a slow optical decay compatible with alpha=0.62 +/- 0.1. R~18.2 at t0+225 min.