TITLE: GCN CIRCULAR NUMBER: 18319 SUBJECT: GRB 150910A: TSHAO optical observations DATE: 15/09/16 11:35:17 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Volnova (IKI), I. Reva (Fesenkov Astrophysical Institute), A. Kusakin (Fesenkov Astrophysical Institute), E. Mazaeva (IKI), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of GRB 150910A (Pagani et al., GCN 18264) with Zeiss-1000 (East) 1-m telescope of Tien Shan Astronomical Observatory on Sep. 11 and Sep. 12. We obtained several images in R filter. The afterglow (Pagani et al., GCN 18264; Zheng & Filippenko, GCN 18265) is clearly visible in a combined image on Sep. 11 and on Sep. 12 we obtained upper limit. The photometry of the combined images are following Date UT start t-T0 Filter Exp. OT Err (mid, days) (s) 2015-09-11 18:39:41 1.38753 R 16*300 21.87 0.10 2015-09-12 19:03:44 2.39553 R 21*300 >22.3 (3 sigma) The photometry is based on SDSS stars used in GCN 18281 (Mazaeva et al.)