GCN Circular 7795
Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report: We imaged the field of GRB 080603 detected by SWIFT (trigger 313087) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France. The observations started 62 min after the GRB trigger (burst occured at the sunset). The elevation of the field decreased from from 63 degrees above horizon and weather conditions were good. We detected the candidate couterpart mentioned by Rujopakarn et al. (GCNC 7792). We note that the afterglow stays at about the same magnitude between 68 to 109 minutes. Magnitudes derived from two R filtered images are: t0+68 min to t0+ 71 min R=17.4 t0+106 min to t0+109 min R=17.5 The afterglow seems to exhibit a plateau phase in its optical light curve. We continue the follow-up. Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction. This message may be cited.