TITLE:   GCN CIRCULAR
NUMBER:  7976
SUBJECT: GRB 080603A: CrAO optical observations
DATE:    08/07/12 15:18:05 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

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

We observed  the field of  INTEGRAL GRB 080603A (Paizis et al., GCN 7790) in 
R-band on June 03 between (UT)  19:16:25 - 19:43:54 with AZT-11(Nauchny) 
telescope of CrAO observatory.   We detect optical afterglow (Gomboc et al., 
GCN 7788; Chornock  et al., GCN 7789)  in coordinates

RA(J2000):  18 37 37.97
Dec(J2000): +62 44 38.9

with uncertanitie is 0.5".

Based on  USNOB1.0 star with ID 1527-0313986 at RA = 18:37:55.186, Dec. 
+62:45:32.28 (R1 = 16.74)  we estimated brightness of  the afterglow in a 
combined image at  0.3424 days:

T0+,       Exposure,   R_mag, UL
(mid time)

0.3424 d  10x180 s  20.62 +/- 0.13   21.8

This message may be cited.