TITLE: GCN CIRCULAR NUMBER: 12633 SUBJECT: GRB 111209A: TAROT La Silla observatory optical detection DATE: 11/12/09 07:58:01 GMT FROM: Alain Klotz at CESR-CNRS Klotz A. (CESR-OMP), Gendre B. (ASDC), Boer M. (OHP-OAMP), Atteia J.L. (LATT-OMP) report: We imaged the field of GRB 111209A detected by SWIFT (trigger 509336) with the TAROT robotic telescope (D=25cm) located at the European Southern Observatory, La Silla observatory, Chile. The observations started 358s after the GRB trigger. The elevation of the field decreased from 13 degrees above horizon and weather conditions were good. We detected the candidate couterpart mentioned by Hoversten et al. (GCNC 12632) at the following position (+/- 1 arcsec): RA(J2000.0) = 00h 57m 22.7s DEC(J2000.0) -46d 48' 05" OT peaked at R~16.2 about 680s after GRB. Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction. This message may be cited.