TITLE: GCN CIRCULAR NUMBER: 15519 SUBJECT: GRB 131127A: Mondy optical upper limit DATE: 13/11/27 13:18:01 GMT FROM: Alina Volnova at SAI MSU E. Klunko (ISTP), A.Volnova (IKI), M. Eselevich (ISTP), A. Pozanenko(IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of the Swift GRB 131127A (Markwardt et al., GCN 15516) with AZT-33IK telescope of Sayan observatory (Mondy) starting Nov., 27 (UT) 10:40:06. We obtained several images in R-filter with exposure of 30 and 60 seconds. Within the XRT circle (Markwardt et al., GCN 15516) we did not detect any optical object. The details of the photometry are the following: UT start, t-T0 Filter Exp. OT UL (mid, days) (s) (3 sigma) 10:40:06 0.02839 R 7*30+21*60 n/d 21.3 The photometry is based on 3 USNO-B1.0 stars: USNO-B id RA Dec R2 1265-0518495 22:11:06.80 +36:35:45.6 16.06 1265-0518432 22:10:59.37 +36:35:56.7 16.45 1266-0522367 22:10:48.55 +36:36:43.7 15.45