TITLE:   GCN CIRCULAR
NUMBER:  7974
SUBJECT: GRB 080603B: optical observations in CrAO
DATE:    08/07/12 08:53:15 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

V. Rumyantsev, K. Antoniuk (CrAO),  A. Pozanenko (IKI) report on behalf of 
larger GRB follow-up collaboration:

We observed the afterglow  (Rujopakarn, et al., GCN 7792) of the Swift GRB 
080603B (Mangano et al., GCN 7794)  on June 04 between (UT) 19:49:07 - 
20:49:27  with AZT-11 (Nauchny) telescope of  CrAO observatory in R-band. 
In a combined image we detect the afterglow. A photometry is obtained in 
comparison with nearby USNOB-1.0 stars:

T0+     Exposure  R_mag            UL
(mid)

1.0087 d  19x180    21.30 +/- 0.25   21.8

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