TITLE: GCN CIRCULAR NUMBER: 14298 SUBJECT: GRB 130313A: Weihai optical upper limit DATE: 13/03/13 20:36:40 GMT FROM: Dong Xu at DARK/NBI D. Xu (DARK/NBI) and C. Cao, S.-M. Hu (SDU) report: We imaged the field of GRB 130313A (Gompertz et al., GCN 14293) with the 1m telescope located in Weihai, Shandong Province, China. Observations started at 17:41:25 UT on 2013-03-13 (i.e., 1.554 hr after the BAT trigger) and 5x600s R-band images were obtained. No optical source is detected within the XRT error circle (Gompertz & Page, GCN 14297) in the stacked image, down to a limit of R>20.5 mag calibrated with nearby USNO B1 stars. We thank Chang-Ming Zhang for carrying out these observations.