GCN Circular 14033
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 121202 detected by SWIFT (trigger 540255) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France. The observations started 34.0s after the GRB trigger (15.8s after the notice). However, the elevation of the field increased from 1 degrees above horizon so it was possible to detect stars on images only 275s after the trigger. The first image does not show any optical counterpart: t0+275s to t0+305s : R > 14.9 We co-added series of exposures: t0+275s to t0+1419s : R > 16.2 t0+1633s to t0+2578s : R > 16.9 Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction. N.B. Galactic coordinates are lon= 45.1864 lat=+32.8357 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.