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GCN Circular 9811

GRB 090813: CrAO optical obsevations
2009-08-15T09:29:00Z (15 years ago)
Alexei Pozanenko at IKI, Moscow <>
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 

T0+     Filter, Exposure, mag.,     err.
(d)             (s)

0.8440   R       57x60     20.50 +/-0.06

Observations will be continued.
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