GCN Circular 9811
Subject
GRB 090813: CrAO optical obsevations
Date
2009-08-15T09:29:00Z (15 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Volnova (SAI MSU), E. Pavlenko, O. Antoniuk, V. Rumyantsev (CrAO), A.
Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 090813 (Cummings et al. GCN 9781)
starting (UT) Aug. 13 23:57:26 with Shajn telescope of CrAO under favorable
weather condition and seeing ~1.6".
At the place of optical afterglow (Gorosabel et al. GCN 9782; Cenko et al.
GCN 9783; Smith et al. GCN 9784) we detect a source which appears slightly
E-W extended.
Preliminary photometry of the source in a combined image based on USNO-B1.0
star (RA(J2000)=15:02:47.99, Dec(J2000)=88:31:41.4) assuming R= 14.23 is
following:
T0+ Filter, Exposure, mag., err.
(d) (s)
0.8440 R 57x60 20.50 +/-0.06
Observations will be continued.