GCN Circular 7883
Subject
GRB 080603A: optical observations on June 04
Event
Date
2008-06-14T11:28:28Z (18 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB
follow-up collaboration:
We observed a field of INTEGRAL GRB 080603A (Paizis et al., GCN 7790) in
R-band on June 04 between (UT) Jun.04 23:18:41 - Jun.05 00:12:41 with
Zeiss-1000 (Simeiz) telescope of CrAO observatory. At the place of the
optical afterglow (Gomboc et al., GCN 7788; Chornock et al., GCN 7789) we
detect an object with coordinates
RA(J2000): 18 37 38.02
Dec(J2000): +62 44 39.44
Within uncertainties (0.5" or better ) the coordinates of the object are
consistent with reported early (Gomboc et al., GCN 7788; Chornock et al.,
GCN 7789) and one can consider the object as afterglow of GRB 080603A.
A group of two extended sources (Perley et al., GCN 7870) is not resolved
in our later observation on 3.496 d (Rumyantsev et al. GCN 7860). The
unresolved source (Rumyantsev et al. GCN 7860) lies ~1.8" south from the
afterglow position. And tentatively one can consider the upper limit of the
observation on 3.496 days R=22.85 (3sigma) as an upper limit of the
afterglow brightness.
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 on
1.521 days:
UT, Exposure, R_mag, UL
(mid time)
1.521 d 27x120 s 22.2 +/- 0.2 22.9
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