GCN Circular 14883
Klotz A. (IRAP-CNRS-OMP), Gendre B. (IRAP-CNRS-OMP), Boer M., Siellez K., Dereli H., Bardho O. (UNS-CNRS-OCA), Atteia J.L. (IRAP-CNRS-OMP) report: We imaged the field of GRB 130612A detected by SWIFT (trigger 557976) with the TAROT robotic telescope (D=25cm) located at the European Southern Observatory, La Silla observatory, Chile. The observations started 34.4s after the GRB trigger (14.5s after the notice). The elevation of the field increased from 40 degrees above horizon and weather conditions were excellents. The first image is trailed with a duration of 60.0s (see the description in Klotz et al., 2006, A&A 451, L39). We detect the OT detected by Racusin et al. (GCNC 14874), Melandri et al. (GCNC 14875). Photometry is done using NOMAD-1 1067-0303513 (R.A.=259.7905194 Dec=+16.7139250 R=16.9) as reference star. At the start of the trail t0+34.4s R=16.9 At the end of the trail t0+94.4s R=17.5 Next images are acquired in tracking mode. The afterglow is visible more than 30 minutes after the burst. One of the last measurement is: From t0+1466s to t0+2113s R=19.9 Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction. This message may be cited.