TITLE: GCN CIRCULAR NUMBER: 20215 SUBJECT: GRB 161129A: TSHAO optical observations / possible afterglow+host galaxy DATE: 16/11/29 16:41:01 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), I. Reva (Fesenkov Astrophysical Institute), A. Kusakin (Fesenkov Astrophysical Institute), A. Volnova (IKI), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of 161129A (Kocevski et al., GCN 20210) with Zeiss-1000 (East) 1-m telescope of Tien Shan Astronomical Observatory. We obtained several images in R filter starting on 2016-11-29 (UT) 12:51:12. Within enhanced XRT position (Beardmore et al. GCN 20211) we detected optical source which is absent in USNO-B1.0 but barely visible in DSS2 (red). At the moment we can not say anything about the source variability. The source might be a superposition of the afterglow and a host galaxy. Preliminary photometry of the source is following Date UT start t-T0 Filter Exp. OT Err. UL (mid, days) (s) 2016-11-29 12:51:12 0.25949 R 13*300 20.60 0.06 22.4 Photometry is based on nearby USNO-B1.0 stars USNO-B1.0_id R2 1221-0612083 17.30 1221-0612140 19.02