TITLE:   GCN CIRCULAR
NUMBER:  18307
SUBJECT: GRB 150911A:   Khureltogot upper limit
DATE:    15/09/14 07:20:31 GMT
FROM:    Alexei Pozanenko at IKI  <alex@grb.rssi.ru>

E. Mazaeva (IKI), S. Schmalz (AIP), N. Tungalag (Research Center of Astronomy and Geophysics MAS), A. Volnova (IKI), I.Molotov (KIAM), 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 ORI-40 telescope of Khureltogot observatory starting on Sep., 11 (UT) 19:03:00, i.e. ~23 minutes after the burst trigger. 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 19:03:00 0.0351 none   45*60 20.9

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