TITLE: GCN CIRCULAR NUMBER: 18708 SUBJECT: GRB 151215A: TSHAO optical observations DATE: 15/12/17 17:16:14 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 GRB 151215A (Gibson et al., GCN 18691) with Zeiss-1000 (East) 1-m telescope of Tien Shan Astronomical Observatory starting on Dec. 15 (UT) 16:47:23. We obtained several images in R filter. The afterglow (Cenko, GCN 18692) is detected in a combined image. Preliminary photometry of the afterglow is following Date UT start t-T0 Filter Exp. OT Err (mid, days) (s) 2015-12-15 16:47:23 0.61190 R 21*300 22.1 0.3 The photometry is based on nearby SDSS stars. GRB 151215A observatory TSHAO date 2015-12-15 UT start 16:47:23.69 t-T0 0.61190 d exptime 21*300 s filter R OT 22.07 +/- 0.38 (вычитанием потоков) uplim 22.4 fwhm 2.4 "