{
  "bibcode": "2014GCN.17053....1X",
  "body": "L. P. Xin,   X. F. Wang,  J. Y. Wei,  Y. L. Qiu, J. S. Deng,  \r\nJ. Wang,  X. H. Han and C. Wu on behalf of EAFON report:\r\n\r\nWe began to observe GRB 141109A (D'Avanzo et al., GCNC 17037)  \r\nwith Xinglong  0.8-m TNT telescope at 2014-11-09, 19:45:06(UT),\r\nabout 13.95 hour after the burst.\r\n\r\nThe optical counterpart reported by ( Covino GCN 17039;  Xu et al., 17040)\r\n was  detected in 24*300 sec R-band coadded image. \r\nThe brightness of the  optical emission is estimated to be \r\nabout R=21.84 mag at the mid-time of 15.07 hours after the burst.\r\n\r\nCombined with the reports ( Covino GCN 17039 and  Xu et al., 17040 ), \r\nthe decay slope of this OT is roughtly about \\alpha~1.12, \r\nif we fit the data with a single power law.\r\n\r\nThe message may be cited.",
  "circularId": 17053,
  "createdOn": 1415625854000,
  "email": "xlp@bao.ac.cn",
  "subject": "GRB141109A : Xinglong TNT optical observation",
  "submitter": "L.P. Xin at NAOC  <xlp@bao.ac.cn>",
  "eventId": "GRB 141109A"
}