TITLE: GCN CIRCULAR NUMBER: 20018 SUBJECT: GRB 161007A: Mondy optical observations DATE: 16/10/08 21:35:58 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), A. Volnova (IKI), I. Korobtsev (ISTP) report on behalf of larger GRB follow-up collaboration: We observed the field of the the GRB 161007A (D'Elia et al., GCN 20008) with AZT-33IK telescope of Sayan observatory (Mondy) starting on October, 07 (UT) 21:51:45. We obtained several images in R-filter. Within XRT error circle (Goad et al., GCN 20013) we do not detected any source. Preliminary photometry of the field is following Date UT start t-T0 Filter Exp. OT UpLim (3 sigma) (mid, days) (s) 2016-10-07 21:51:45 0.03025 R 35*60 n/d 21.5 Photometry is based on nearby USNO-B1.0 stars USNO-B1 R2 1133-0144160 15.67 1133-0144193 15.95 1133-0144230 14.48