GCN Circular 6747
gcncircL.P. Xin, M.Zhai, Y.L. Qiu, J.Y. Wei, J.Y. Hu, J.S. Deng, Y. Urata, and W.K. Zheng on behalf of EAFON report: We have imaged the field of GRB 070810B (Marshall et al., GCN 6743) with the Xinglong TNT 80cm telescope. Observation started from 15:24:17, 300s after the burst. A series of White and R band images were obtained. Preliminary analysis shows no new object was seen in our combined image within BAT error circle. The 3 sigam limit is ~20.5 in our co-added 20*20s White band image with mean time ~550s after the burst, and ~21.7 in co-added 11*360s R band image with mean time ~44 minutes after the burst derived from USNO-B1.0, Further analysis is on going. This message may be cited.