TITLE: GCN CIRCULAR NUMBER: 19829 SUBJECT: GRB 160816A: TSHAO optical observations DATE: 16/08/21 13:37:01 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 160816A (Racusin et al., GCN 19802; Mailyan et al., GCN 19804) with Zeiss-1000 (East) 1-m telescope of Tien Shan Astronomical Observatory. We obtained several images in R filter starting on August 17 and 18. We detected optical afterglow (Guidorzi et al. GCN 19808; Troja et al. GCN 19809) on Aug. 17 and obtained upper limit on Aug. 18. Preliminary photometry of a combined image is following Date UT start t-T0 Filter Exp. OT Err. UL (mid, days) (s) 2016-08-17 21:32:28 1.19553 R 105*30 21.70 0.20 21.9 2016-08-18 19:11:47 2.11663 R 148*30 n/d n/d 22.1 Photometry is based on nearby USNO-B1.0 stars USNO-B1.0_id R2 1271-0576219 17.27 1271-0576200 17.52 1271-0576190 18.12 1271-0576101 17.00