TITLE: GCN CIRCULAR NUMBER: 18441 SUBJECT: GRB 151022A: Mondy optical upper limit DATE: 15/10/22 19:35:01 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Klunko (ISTP), E. Mazaeva (IKI), A. Volnova (IKI), I. Korobtsev (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of Swift GRB 151022A (D'Avanzo et al., GCN 18436) with AZT-33IK telescope of Sayan observatory (Mondy) starting on Oct. 22 (UT) 15:05:04. We obtained several images in R-filter of 30 s exposure. Within XRT error circle (Evans, GCN 18438) we do not detect any optical source in any single image. Upper limit (3 sigma) of a single image is R ~ 19.4m. Photometry is based on nearly USNO-B1.0 (R2) stars.