TITLE: GCN CIRCULAR NUMBER: 22811 SUBJECT: GRB 180620A: Xinglong-2.16m optical observations DATE: 18/06/20 19:20:31 GMT FROM: Dong Xu at NAOC/CAS 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.