GCN Circular 4048
Subject
GRB050922C: optical observation
Event
Date
2005-09-29T13:12:57Z (20 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
M. Andreev (Institute of Astronomy), A. Pozanenko, V. Loznikov (IKI) and
V.Rumyantsev (CrAO), on behalf of larger GRB follow up collaboration report:
We observed OT (GCNs 4011, 4012, Rykoff et al.) of GRB050922C (GCN4013
Norris et al.) in R-band with 60 cm telescope of Peak Terskol observatory
starting Sep. 22 (UT) 20:08:45 (Andreev et al. GCN4016). 61 images of 60 s
exposure were taken between (UT) 20:08:45 and 21:18:20. The photometry
calibration was done against USNO-A2.0.
Light curve of OT may be approximated with two power laws: index alpha
= -0.67 (0.02) between T0+ 0.00862d and T0+ 0.04338d, alpha = -1.24 (0.15)
starting on T0+ 0.04338d with a break at ~T0+1h.
Preliminary light curve can be found in http://grb.rssi.ru/GRB050922c/
The message may be cited.