GCN Circular 10207
Subject
GRB 091127: optical observations
Event
Date
2009-11-29T12:56:34Z (17 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
M. Andreev, A. Sergeev (Terskol Branch of Institute of Astronomy), A.
Pozanenko (IKI) on behalf of larger GRB follow up collaboration report:
We observed the optical afterglow (Smith et al. GCN 10192) of the Swift GRB
091127 (Troja et al. GCN 10191) with the Z-600 telescope of Mt.Terskol
observatory in R-filter on Nov 28. In a combined images we clearly detect
the afterglow.
The photometry is based on the reference star used in GCN 10205 (the star
#0710-0025176 of the USNO B1 catalog, assuming R2=14.02):
T0+ Filter, Exposure, mag.
(d) (s)
0.7981 R 10x180 18.60 +/- 0.10
0.9141 R 10x180 18.90 +/- 0.15
The photometry confirms the a global decay slope of ~0.8 within the first
day after burst (Xu et al. GCN 10205).