{
  "bibcode": "2018GCN.22320....1X",
  "body": "L. P. Xin,   C. Liu,  J. Y. Wei,  Y. L. Qiu, J. S. Deng,  \nJ. Wang,  X. H. Han, X. M. Meng and C. Wu report:\n \nWe began to observe GRB 180111A (Lien et a l., GCN22318)  \nwith Xinglong  0.8-m TNT telescope at 2018-01-11, 14:43:34(UT),\nabout 93 sec the burst.\n \nWe obtained several white and R-band images.\nIn any single white band frame, no any new optical transient \nwas detected within UVOT circle and XRT circle \n(Lien et a l., GCN22318, Evens et al., GCN 22319) \ndown to 18.5 magnitude at the mid time of 113 sec after the burst  .\n\nHowever, there is a marginal source in the 20*20sec coadded image \nwithin the XRT circle  (Evens et al., GCN 22319),  whose position is consistent \nwith  the location of the reported optical counterpart (Lien et a l., GCN22318). \nThe brightness is about 20.0+/-0.3 calibrated by the local USNO B1.0 R2 mag\nat the mid time of 300 sec after the burst. \n\n\nWe are making further analysis for the possible low S/N detection \nsince there is a bright star near the GRB location.\n \nThe message may be cited.\n\n[GCN OPS NOTE(11jan18):  The latter 'A' was added to the GRB name\nin the Subject-line.]",
  "circularId": 22320,
  "createdOn": 1515712838000,
  "email": "xlp@nao.cas.cn",
  "subject": "GRB180111A: Xinglong TNT possible optical detection",
  "submitter": "L.P. Xin at NAOC  <xlp@nao.cas.cn>",
  "eventId": "GRB 180111A"
}