TITLE: GCN CIRCULAR NUMBER: 17629 SUBJECT: GRB 150323C: Xingming upper limit DATE: 15/03/24 04:09:25 GMT FROM: Dong Xu at DARK/NBI D. Xu (DARK/NBI), X. Gao (Urumqi No.1 Senior High School, Xinjiang), and Z.-J. Xu (Nanjing Putian Telecommunications Co. Ltd., Jiangsu) report: We observed the field of GRB 150323C (Amaral-Rogers et al., GCN 17621) using the 0.35m robotic Xingming telescope located at Nanshan, Xinjiang, China. Observations started at 17:08:06 UT on 2015-03-23, i.e., 165 s after the burst, and a series of 40s, 60s, and 90s unfiltered exposures were obtained. No optical source is detected at the enhanced Swift-XRT position (Evans, GCN 17624), down to a limiting magnitude of ~19.2 mag since the starting of our observations.