TITLE: GCN CIRCULAR NUMBER: 12576 SUBJECT: GRB 111117A: optical upper limit in CrAO DATE: 11/11/20 15:51:37 GMT FROM: Alexei Pozanenko at IKI, Moscow V. Rumyantsev, N. Pit (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed field of the Swift GRB 111117A (Mangano et al. GCN 12559) with AZT-11 telescope of CrAO in R filter between Nov. 17 (UT) 16:11:05 - 17:14:24, i.e. starting ~ 4 h after burst trigger. We took several images of 180 exposure under variable weather conditions and mean seeing (FWHM) of about 2.7". We do not detect any source within XRT position (Melandri et al. GCN 12565). A photometry is based on the USNO B1.0 1130-0013895 star (00:50:46.48 +23:01:28.8) assuming R=16.98: T0+ Filter, Exposure, OT, UpperLimit (mid, d) (s) 0.1879 R 22x180 n/d 20.6