TITLE: GCN CIRCULAR NUMBER: 19670 SUBJECT: GRB 160629A: Mondy optical observations DATE: 16/07/09 11:12:49 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), A. Volnova (IKI), P. Minaev (IKI), I. Korobtsev (ISTP) report on behalf of larger GRB follow-up collaboration: We observed the field of the INTEGRAL GRB 160629A (Gotz et al., GCN 19621) with AZT-33IK telescope of Sayan observatory (Mondy) starting on July, 01 (UT) 18:39:36. We obtained several images in R-filter. Within XRT error circle (D'Ai et al., GCN 19641) we detected optical afterglow (Klotz et al., GCN 19622; Sokolov et al., GCN 19623). Preliminary photometry of the field is following Date UT start t-T0 Filter Exp. OT UpLim (3 sigma) (mid, days) (s) 2016-07-01 18:39:36 1.86436 R 20*120 21.73+/-0.15 22.5 Photometry is based on nearby USNO-B1.0 stars USNO-B.1_id R2 1669-0002297 15.53 1669-0002325 15.34 1669-0002281 15.48 1669-0002346 16.43 1669-0002192 15.78