TITLE: GCN CIRCULAR NUMBER: 17443 SUBJECT: GRB 150211A: Mondy optical upper limit DATE: 15/02/11 19:32:58 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), A. Volnova (IKI), E. Klunko (ISTP), I. Korobtsev (ISTP), M. Eselevich (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of GRB 150211A (Starling, et al., GCN 17434) with AZT-33IK telescope of Sayan observatory (Mondy). We obtained several images in R-filter on Feb., 11, starting (UT) 12:02:35. Within XRT error cirvle (Campana, et al.,GCN 17435) we do not detect any optical source. Upper limit is following Date UT start t-T0 Filter Exp. UL(3sigma) (mid, days) (s) 2015-02-11 12:02:35 0.03091 R 1800 21.9 The photometry is based on nearby USNO-B1.0 stars: USNO-B1.0_id R2 1453-0255559 18.45 1453-0255560 18.27 1453-0255536 18.49