{
  "bibcode": "2013GCN.15425....1X",
  "body": "L. P. Xin,   J. Y. Wei,   Y. L. Qiu, J. S. Deng,  J. Wang,  \r\nX. H. Han and C. Wu on behalf of EAFON report:\r\n\r\nWe began to observe GRB 131030A  (Troja et al. GCN 15402) \r\nwith Xinglong 0.8-m TNT telescope at 13:59:04 (UT) , Oct. 31th,\r\nabout 17 hours after the burst.  10*300 sec  R-band images were obtained. \r\n\r\nThe optical counterpart (Troja et al. GCN 15402)   was clearly detected \r\nwith a magnitude of 19.4+/-0.1 mag in R band, calibrated by USNO B1.0 R2mag \r\nat the mean time of 17.397h after the burst.\r\n\r\nThis message may be cited.",
  "circularId": 15425,
  "createdOn": 1383290948000,
  "email": "xlp@bao.ac.cn",
  "subject": "GRB131030A : xinglong TNT optical observation",
  "submitter": "L.P. Xin at NAOC  <xlp@bao.ac.cn>",
  "eventId": "GRB 131030A"
}