GCN Circular 5653
Subject
GRB060908: optical observations
Event
Date
2006-09-29T14:58:49Z (19 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
M. Andreev, A. Sergeev (Terskol Branch of Institute of Astronomy), A.
Kurenya (Baksan Neutrino Observatory), A. Pozanenko (IKI) on behalf of
larger GRB follow up collaboration report:
We observed the afterglow of GRB060908 (Evans et al., GCN 5544) with 2m
telescope of Terskol Observatory on Sep. 08 (UT) 20:51:45 - 21:14:45. We
detect the afterglow on a combined image of 20x60 s exposure. Based on USNO
A2.0 field stars we estimate brightness of the optical transient:
Mid time (UT), Exposure, R_mag
Sep. 08.877 20x60 s 20.70 +/- 0.27
It should be noted that R magnitude of the star (USNO-B1.0 0903-0022606 R
= 18.29) used in GCN 5552 (Wiersema et. al) is inconsistent with the
R-magnitude of the same star USNO A2.0 (0900-00494220 R = 14.9).
R-magnitudes of other field stars of the two catalogs USNO-B1.0 and USNO
A2.0 are also inconsistent by ~2.9 mag in average.
The message may be cited.