{
  "bibcode": "2007GCN..6747....1X",
  "body": "gcncircL.P. Xin, M.Zhai, Y.L. Qiu, J.Y. Wei, J.Y. Hu, J.S. Deng,\nY. Urata, and W.K. Zheng on behalf of EAFON report:\n\nWe have imaged the field of GRB 070810B (Marshall   et al., GCN 6743)\nwith the Xinglong TNT 80cm telescope. Observation started from\n15:24:17, 300s after the burst. A series of White and R band images\nwere obtained. Preliminary analysis shows no new object was seen in\nour combined image within BAT error circle. The 3 sigam limit is\n~20.5 in our co-added 20*20s White band image with mean time ~550s\nafter the burst, and ~21.7 in co-added 11*360s R band image with mean\ntime ~44 minutes after the burst derived from USNO-B1.0, Further\nanalysis is on going. \n\nThis message may be cited.",
  "circularId": 6747,
  "createdOn": 1186770113000,
  "email": "zwk@bao.ac.cn",
  "subject": "GRB 070810B: Xinglong TNT optical Upper Limit",
  "submitter": "W.K. Zheng at NAOC  <zwk@bao.ac.cn>",
  "eventId": "GRB 070810B"
}