GCN Circular 6783
Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report: We imaged the field of GRB 070913 detected by SWIFT (trigger 290843) with the TAROT robotic telescope (D=25cm) located at the European Southern Observatory, La Silla observatory, Chile. The observations started 87.3s after the GRB trigger (69.4s after the notice). The elevation of the field decreased from from 35 degrees above horizon and weather conditions were good. The date of trigger : t0 = 2007-09-13T00:36:44.064 The first image is 30.0s exposure in tracking mode. We do not detect any OT with a limiting magnitude of: t0+87.3s to t0+117.3s : R > 17.8 We co-added a series of exposures: t0+123.6s to t0+576.5s : R > 18.4 Further observations are in progress. Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction. N.B. Galactic coordinates are lon=340.2109 lat=+27.9232 and the galactic extinction in R band is 0.4 magnitudes estimated from D. Schlegel et al. 1998ApJ...500..525S. This message may be cited.