TITLE: GCN CIRCULAR NUMBER: 13319 SUBJECT: GRB 120521C: TAROT Calern observatory optical observations DATE: 12/05/22 00:18:05 GMT FROM: Alain Klotz at CESR-CNRS 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 120521C detected by SWIFT (trigger 522656) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France. The observations started 23 min after the GRB trigger. The elevation of the field decreased from 68 degrees above horizon but humidity was higher than 93% until 23 min after the trigger preventing the record of the beginning of the event. We co-added a series of exposures. No OT was found in the XRT error box (Baumgartner et al. GCNC 13318). start stop 23min 37min R > 19.4 Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction. This message may be cited.