GCN Circular 10205
Subject
GRB 091127: Further NOT optical observations
Date
2009-11-28T23:09:07Z (14 years ago)
From
Dong Xu at DARK,NBI <dong@astro.ku.dk>
D. Xu (WIS, DARK/NBI), D. Malesani, J. Hjorth (DARK/NBI), P. Jakobsson
(Univ. of Iceland), A. Carmona, C. Baldovin-Saavedra (ISDC & Geneva
Observatory) report on behalf of a
larger collaboration:
We continued to observe the field of GRB091127 (Troja et al., GCN 10191;
Smith et al., GCN 10192; Immler et al., GCN 10193) at the Nordic Optical
Telescope equipped with StanCam. Among a series of observations, a 60 s
R-band frame was obtained staring at 21:51:50 UT on Nov. 28th, 22.4347
hr after the burst trigger.
The optical afterglow is clearly detected in the frame. The magnitude is
R=18.95+/-0.04, calibrated with the reference star #0710-0025176
(R2=14.02) in the USNO B1 catalog. Comparison with our previous
observation (Xu et al., GCN 10196) indicates a decay slope of ~0.8
between the two epochs.