TITLE: GCN CIRCULAR NUMBER: 14581 SUBJECT: GRB 130502A: optical upper limit DATE: 13/05/05 22:25:32 GMT FROM: Alexei Pozanenko at IKI, Moscow V. Rumyantsev (CrAO), K.Antoniuk (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of the Swift GRB 130502A (Troja et al., GCN 14527) with AZT-11 telescope of CrAO observatory on May 02 starting on (UT) 18:20:46, i.e. ~30 min after burst trigger. We took several images in R-filter of 180 s exposure. Within enchanced XRT position (Beardmore et al., GCN 14536) we do not detect any source. Preliminary photometry of a combined image is following T_start (UT) T0+ Filter Exp. OT UpperLimit (3 sigma) mid,days s 2013-05-02T18:20:46.18 0.0419 R 3600 n/d 20.8 The photometry is based on USNO-B1.0 star 0898-0181247 09 14 15.80 -00 08 13.7 assuming R=18.02.