GCN Circular 2753
Subject
GRB040924,optical observation
Event
Date
2004-09-27T14:30:35Z (22 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Pavlenko, S. Sergeev, V.Rumyantsev (CrAO), A.Pozanenko (IKI) report:
We observed the field of the optical afterglow candidate (Fox and Moon, GCN
2734) of GRB 040924 (=H3564, Fenimore et al., GCN 2735) in the R (Johnson)
band with APOGEE 47 on the 38-cm Cassegrain telescope of the Crimean
Astrophysical Observatory.
The observations were started at Sep. 24, 20:21 UT (i.e. 8.48 hours after
the burst) and continued up to Sep.24, 23.13 UT. The sum of the first 3
images
(3x190-s) yield the limiting magnitude 19.7 +- 0.2. No optical counterpart
at the position proposed by Fox and Moon was found. For the sum of last
7x240 images taken between Sep. 24 23:08 - 23:46 UT no counterpart fainter
than 21.0 +- 0.2 was detected. The limiting magnitudes were estimated in
comparison of the USNO-B1.0 stars as photometric sequences. The limits are
in agreement with OT magnitude estimation in simultaneous observation of
I.Khamitov et al. (GCN 2749).
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