TITLE:   GCN CIRCULAR
NUMBER:  18306
SUBJECT: GRB 150910A: Mt. Terskol observatory optical observation
DATE:    15/09/14 07:16:41 GMT
FROM:    Alexei Pozanenko at IKI  <alex@grb.rssi.ru>

M. Andreev (Terskol Branch of INASAN), E. Mazaeva (IKI), A. Sergeev (Terskol Branch of INASAN), A. Volnova (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-600 telescope of Mt. Terskol observatory in R-filter starting on Sep. 10 (UT) 20:45:05. We obtained several unfiltered images. The afterglow (Pagani et al., GCN 18264; Zheng & Filippenko, GCN 18265) is clearly detected in a combined image. The photometry of the combined image is following

Date UT start t-T0 Filter Exp. OT Err
(mid, days) (s)

2015-09-10 20:45:05 0.51974 R 46*120 20.46 +/- 0.07

The photometry is based on SDSS stars used in GCN 18281 (Mazaeva et al.)