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GCN Circular 18035

Subject
GRB 150711A: Burakan-ISON optical observations
Date
2015-07-18T22:00:01Z (9 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), V. Nevskiy (ISON) I. Molotov (KIAM), A. Pozanenko 
(IKI) report on behalf of larger GRB follow-up collaboration:

We observed the field of GRB 150711A (Bernardini et al. GCN 18011) with 
the 40 cm telescope of Burakan-ISON observatory starting on Jul., 11 
(UT) 18:36:16, i.e. ~13 min after burst trigger. We obtained several 
unfiltered images. In a combined image we  do not detect any source 
within the XRT error box (Osborne et al. GCN 18012) down to a limiting 
magnitude of R = 16.9

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

2015-07-11 18:36:16  0.01250   none     9*60  n/d   16.9

The photometry is based on nearby USNO-B1.0  stars.
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