GCN Circular 22276
Subject
GRB 171222A: Nanshan-0.36m optical upper limit
Event
Date
2017-12-23T14:34:17Z (8 years ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
H.J. Tan (CCU), H.X. Feng, Z.P. Zhu, D. Xu (NAOC), X. Gao (Urumqi No.1
Senior High School) report
We observed the field of GRB 171222A (Racusin et al., GCN 22265) using
the 0.36m robotic telescope located at Nanshan, Xinjiang, China.
Observations started at 17:04:17 UT on 2017-12-22, i.e., 39.3 mins after
the BAT trigger, and all imaged were taken without filter.
No optical source is detected at the XRT position (Osborne et al., GCN
22266) as well as the NOT position (Perley et al., GCN 22269), down to a
limiting magnitude of m(R)~19.3, calibrated with the USNO B1 field.