TITLE: GCN CIRCULAR NUMBER: 14570 SUBJECT: GRB 130505A; Weihai optical observations DATE: 13/05/05 13:43:31 GMT FROM: Dong Xu at DARK/NBI D. Xu (DARK/NBI), C. Cao, S.-M. Hu, J.-M. Ai (SDU) report: We observed the field of GRB 130505A (Cannizzo et al., GCN 14563) with the 1m telescope located in Weihai, Shandong Province, China. We obtained 2x600s frames in the solan r-filter with a mean time of 3.3724 hr after the BAT trigger. The optical afterglow is clearly detected at the UVOT position with r=18.4 +/- 0.1 mag, calibrated against the SDSS field.