TITLE: GCN CIRCULAR NUMBER: 18928 SUBJECT: GRB 160123A: LCOGT-SSO optical upper limit DATE: 16/01/23 16:38:07 GMT FROM: Dong Xu at NAOC/CAS Y.-D. Hu (IAA-CSIC), D. Xu (NAOC/CAS), Y. Qing (Geneva Observatory), Y.-H. Han (NAOC/CAS, HUST) report: We observed the field of GRB 160123A (Malesani et al., GCN 18926) using the LCOGT-1m located at the Siding Spring Observatory. We obtained 20x150s R-band images, starting at 12:04:41 UT on 2016-01-23, i.e., 3.106 hr after the burst. No optical source is detected at the enhanced XRT position of this GRB (Beardmore et al., GCN 18927), down to a limiting magnitude of R~21.0 mag, calibrated with nearby USNO B1 stars.