GCN Circular 22811
Subject
GRB 180620A: Xinglong-2.16m optical observations
Date
2018-06-20T19:20:31Z (6 years ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
Z.P. Zhu, D. Xu, J.B. Zhang (NAOC), X. Zhang, J.H. Liu (XAO) report
We observed the field of GRB 180620A (Evans et al., GCN 22790) using the
2.16-m telescope located at Xinglong, Hebei, China, equipped with the
BFOSC camera. We obtained 3x600s R-band frames, starting at 12:39:01 UT
on 2018-06-20, i.e., 4.068 hrs after the BAT trigger.
The GRB's optical afterglow (Evans et al., GCN 22790; Butler et al., GCN
22799; Elenin et al., GCN 22800; Tyurina et al., GCN 22801; Guidorzi et
al., GCN 22803) is clearly detected in each frame. Preliminary
photometry shows the afterglow has decayed to m(R)~20.0, calibrated with
nearby USNO B1 stars.
We acknowledge the excellent support from the Xinglong staff,
particularly Xiao Feng and Huijuan Wang, in obtaining these observations.