{
  "bibcode": "2010GCN.10705....1X",
  "body": "L.P. Xin, Z.X. Lin, Y.L. Qiu, J.Y. Wei,J. Wang, J.S. Deng, \nC. Wu, J.Y. Hu, on behalf of EAFON report:\n\nWe began to observe GRB100423A (Stroh et al., GCN 10651;\nFilgas et al., GCN 10652; Ivarsen et al., GCN 10653) \nwith Xinglong TNT telescope at 14:33:45(UT). The moon \nlight was very bright. A series of R band images was \nobtained. No new source was found in the XRT errorbars \nwithin the combined 6*300s R band image. The 3 sigma upper \nlimit is about 19.5 mag derived from USNO-B1.0,at the mean \ntime of 14.2 hour after the burst.\n\nThis message may be cited.\n\nFor more information about Xinglong GRBs Follow-up\nobservations, please visit the website:\nhttp://www.xinglong-naoc.org/grb/",
  "circularId": 10705,
  "createdOn": 1272559842000,
  "email": "xlp@bao.ac.cn",
  "subject": "GRB 100423A: xinglong TNT optical upper limit",
  "submitter": "L.P. Xin at NAOC  <xlp@bao.ac.cn>",
  "eventId": "GRB 100423A"
}