{
  "bibcode": "2007GCN..6424....1X",
  "body": "L.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 070520 (P. Romano et al., GCN 6423)\nwith the EST 1m telescope at Xinglong Observatory?  \nObservation started from 13:14:54 UT, 579s after the burst\nwith R band filter, \nwe derieved 3 sigam limit is ~20.6 in our 20*60s co-added images \nwithmean time ~20minutes.\n\nThis message may be cited.",
  "circularId": 6424,
  "createdOn": 1179673584000,
  "email": "xlp@bao.ac.cn",
  "subject": "GRB 070520: Xinglong EST optical Upper Limit",
  "submitter": "L.P. Xin at NAOC  <xlp@bao.ac.cn>",
  "eventId": "GRB 070520"
}