GCN Circular 12683
Subject
GRB 111215A: GMG optical upper limit
Date
2011-12-15T17:07:53Z (12 years ago)
From
Dong Xu at Weizmann Inst <dong.dark@gmail.com>
D. Xu (WIS/NAOC), X.-H. Zhao (YNAO), J.-R. Mao (KASI/YNAO), J.-M. Bai
(YNAO) report:
We observed the field of GRB 111215A (Oates et al., GCN 12681) at the
2.4m Gao-Mei-Gu (GMG) telescope equipped with YFOSC. Observations
started at 14:26:44 UT (i.e., 22.6 mins after the burst) and a series
of R-band images (totally 1700s exposure) were obtained in a seeing of
~2.8".
No optical source was detected within the XRT error circle (ref., GCN
12681) to a 3sigma limit of R~22.8 mag, calibrated with nearby USNO B1
stars.
The image trigger mode of this burst and the above R-band upper limit
might indicate high-redshift. NIR follow-ups are encouraged.
We thank the GMG staff, especially Y.-X. Xin, D.-Q. Wang, and Y.-D.
Lang for performing the observations.
[GCN OPS NOTE(15dec11): Par author's request, the last sentence was added.]