[vsnet-grb-info 17027] GRB 150911A: Mt. Terskol observatory upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18308
SUBJECT: GRB 150911A: Mt. Terskol observatory upper limit
DATE:    15/09/14 07:27:05 GMT
FROM:    Alexei Pozanenko at IKI  <alex at 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 150911A (Starling et al., GCN 18280) with Zeiss-600 telescope of Mt. Terskol observatory in R-filter starting on Sep. 11 (UT) 23:26:40. We do not detect any object within enhanced XRT error circle (Goad et al., GCN 18283). Photometry of the field is following

Date UT start        t-T0 Filter Exp.   Upper_Limit (3sigma)
                     (mid, days) (s)

2015-09-11 23:26:40 0.2273 R     40*120 21.7

Photometry is based on nearby USNO-B.1 stars
USNO-B.1_id R2
0957-0043966 15.54
0957-0043954 16.24
0957-0043961 16.45