GCN Circular 13589
Klotz A. (IRAP-CNRS-OMP), Gendre B. (ASDC/INAF-OAR), Boer M. (UNS-CNRS-OCA), Atteia J.L. (IRAP-CNRS-OMP) report: We imaged the field of GRB 120805A detected by SWIFT (trigger 530031) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France. The observations started 77.2s after the GRB trigger (19.3s after the notice). The elevation of the field decreased from 20 degrees above horizon and weather conditions were moonlight. The first image is trailed with a duration of 60.0s (see the description in Klotz et al., 2006, A&A 451, L39). We do not detect any OT in the BAT error box with a limiting magnitude of: t0+77.2s to t0+137.2s : R > 15.9 The second image is 30.0s exposure in tracking mode: t0+152.6s to t0+182.6s : R > 16.2 We co-added a series of exposures: t0+152.6s to t0+851s : R > 17.4 Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction. N.B. Galactic coordinates are lon=353.7578 lat=+58.9832 and the galactic extinction in R band is about 0.1 magnitude estimated from D. Schlegel et al. 1998ApJ...500..525S. This message may be cited.