GCN Circular 12798
Subject
GRB 111228A: optical observations in CrAO
Date
2012-01-02T14:52:27Z (12 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
V. Rumyantsev, (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB
follow-up collaboration:
We observed the field of GRB 111128A (Ukwatta et al. GCN 12737) with Shajn
telescope of CrAO observatory between (UT) 2011-12-28T23:08:08 and
2011-12-29T01:04:41 under a mean seeing of 1.5". We took several frames
with exposure of 60 s in BVRI. The photometry optical afterglow (Ukwatta et
al. GCN 12737; Xin et al. GCN 12738) is based on the USNO B1.0 star
1083-0199833 (10 00 22.70 +18 19 23.5) assuming B=18.85, R=17.28, I=17.02
.
T0+ Filter, Exposure, OT, uplim (3 sigma)
(mid, d) (s)
0.3476 B 27x60 19.270 +/- 0.007 23.6
0.3491 R 27x60 18.710 +/- 0.005 23.5
0.3499 I 27x60 18.608 +/- 0.006 23.2