TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5057 SUBJECT: GRB 060502B: Xinglong optical observation DATE: 06/05/02 20:40:39 GMT FROM: W.K. Zheng at NAOC M.Zhai, Y.L. Qiu, J.Y. Wei, J.Y. Hu, J.S. Deng(NAOC),X.F. Wang (THCA), K.Y. Huang (NCU), Y. Urata (Saitama Univ.) on behalf of EAFON report: "We have imaged the field of GRB 060502B (Troja et al. GCN 5055) with clear, R and I band using the 0.8m telescope at Xinglong Observatory. First imaging was started from 305 s after the trigger. The limiting magnitude is clear = ~ 20 (12 min after) and R=20.6 (60 min after) derived from USNO-B1.0 r catalog. No new source was detected brighter than the limits in the XRT error circle. Further analysis is in progress." This message may be cited.