{
  "bibcode": "2011GCN.12683....1X",
  "body": "D. Xu (WIS/NAOC), X.-H. Zhao (YNAO), J.-R. Mao (KASI/YNAO), J.-M. Bai\n(YNAO) report:\n\nWe observed the field of GRB 111215A (Oates et al., GCN 12681) at the\n2.4m Gao-Mei-Gu (GMG) telescope equipped with YFOSC. Observations\nstarted at 14:26:44 UT (i.e., 22.6 mins after the burst) and a series\nof R-band images (totally 1700s exposure) were obtained in a seeing of\n~2.8\".\n\nNo optical source was detected within the XRT error circle (ref., GCN\n12681) to a 3sigma limit of R~22.8 mag, calibrated with nearby USNO B1\nstars.\n\nThe image trigger mode of this burst and the above R-band upper limit\nmight indicate high-redshift. NIR follow-ups are encouraged.\n\nWe thank the GMG staff, especially Y.-X. Xin, D.-Q. Wang, and Y.-D.  \nLang for performing the observations.\n\n[GCN OPS NOTE(15dec11): Par author's request, the last sentence was added.]",
  "circularId": 12683,
  "createdOn": 1323968873000,
  "email": "dong.dark@gmail.com",
  "subject": "GRB 111215A: GMG optical upper limit",
  "submitter": "Dong Xu at Weizmann Inst  <dong.dark@gmail.com>",
  "eventId": "GRB 111215A"
}