TITLE: GCN CIRCULAR NUMBER: 22145 SUBJECT: GRB 171120A: Xinglong-2.16m optical upper limit DATE: 17/11/22 04:24:59 GMT FROM: Dong Xu at NAOC/CAS Z.P. Zhu, H.X. Feng, D. Xu (NAOC), Y. Zhao, F. Xiao (NAOC), S.B. Qian (YNAO), Y.D. Hu (IAA-CSIC) report We observed the field of GRB 171120A (Tohuvavohu et al., GCN 22133) using the 2.16-m telescope located at Xinglong, Hebei, China, equipped with BFOSC. We obtained 1x600s and 2x900s R-band frames, starting at 18:54:02 UT on 2017-11-20, i.e., 5.57 hr after the BAT trigger. No optical source was detected in the stacked image at the XRT position (Evens et al., GCN 22135), down to the limiting magnitude of R~21.5 mag at the median time of 5.95 hr post-burst, calibrated with the SDSS field.