GCN Circular 9826
Subject
GRB 090817: optical upper limit
Event
Date
2009-08-18T12:02:36Z (17 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
V. Rumyantsev (CrAO), A. Pozanenko (IKI), M. Andreev (Terskol Branch of
Institute of Astronomy) report on behalf of larger GRB follow-up
collaboration:
We observed a field of the INTEGRAL GRB 090817 (Beckmann et al., GCN 9815)
with Shajn telescope of CrAO starting on Aug. 17 (UT) 01:07, i.e. ~17
minutes after burst onset. A series of 37 images of 60 s exposure was
obtained in R filter. Within XRT error circle of the afterglow (Evans et
al., GCN 9819, GCN 9825) we do not detect any new object. The quoted
USNO-B1.0 star USNO-B1.0 1341-0096763 (Evans et al., GCN 9819) does not
change its brightness within ~0.08 m during our observations. An upper limit
of a single frame of 60 s exposure is R~21.5 m. Data reduction is
continuing.