{
  "bibcode": "2012GCN.13960....1X",
  "body": "L. P. Xin,  Y. L. Qiu,  J. Y. Wei,  J. Wang,  J. S. Deng, \nC. Wu,  X. H. Han on behalf of EAFON report:\n\nWe began to observe GRB121108A ( Ukwatta  et al., GCN 13952 ) \nwith Xinglong TNT telescope at  17:49:47 (UT), about 128s after \nthe burst.  A series of white and R-band images were obtained. \nNo any optical counterpart was found in the X-ray errorbox \n(Beardmore et al., GCN 13959).  The 3 sigma upper limit is about 19.9 \nmag in R-band calibrated by USNO B1.0 R2 mag,  at the mean \ntime of 58 min after the burst. \n\nThis message may be cited.",
  "circularId": 13960,
  "createdOn": 1352463738000,
  "email": "xlp@bao.ac.cn",
  "subject": "GRB 121108A: Xinglong TNT upper limit",
  "submitter": "L.P. Xin at NAOC  <xlp@bao.ac.cn>",
  "eventId": "GRB 121108A"
}