[vsnet-grb-info 8286] GRB 090813: CrAO optical obsevations
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Sat Aug 15 18:29:06 JST 2009
TITLE: GCN CIRCULAR
NUMBER: 9811
SUBJECT: GRB 090813: CrAO optical obsevations
DATE: 09/08/15 09:29:00 GMT
FROM: Alexei Pozanenko at IKI, Moscow <apozanen at 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.
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