GCN Circular 6588
Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report: We imaged the field of GRB 070628 detected by SWIFT (trigger 283320) with the TAROT robotic telescope (D=25cm) located at the European Southern Observatory, La Silla observatory, Chile. The observations started 8.3h after the GRB trigger (started at the begining of the night). The elevation of the field decreased from from 22 degrees above horizon and weather conditions were good. We co-added a series of exposures filtered in R, V and I. We do not detect any OT at the UVOT location (Gronwall & Holland GCN Circ. 6585): t0+8.3h to t0+9.1h : R > 17.9 Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction. N.B. Galactic coordinates are lon=236.5513 lat= +1.2335 and the galactic extinction in R band is 2.4 magnitudes estimated from D. Schlegel et al. 1998ApJ...500..525S. This message may be cited.