{
  "bibcode": "2011GCN.12339....1Z",
  "body": "X.-H. Zhao (YNAO), D. Xu (WIS), J.-R. Mao & J.-M. Bai (YNAO) report on\na larger collaboration:\n\nWe observed the XRT field (Evans, GCN 12336) of GRB 110915A (Holland\net al., GCN 12335) with the 2.4m GMG telescope in Yunnan, China\nequipped with YFOSC. Observations started at 13:58:09 UT, 15th Sep.\n2011 (i.e., 0.6236 hr after the burst), and 1x20 min R-band and 1x20\nmin V-band images were obtained under the cloudy weather.\n\nNo optical source was present within the XRT error circle in GCN\n#12336, which sets a 3\\sigma upper limit of R~21.6 mag, calibrated\nwith the USNO B1 catalog.",
  "circularId": 12339,
  "createdOn": 1316106338000,
  "email": "dong.dark@gmail.com",
  "subject": "GRB 110915A: GMG optical upper limit",
  "submitter": "Dong Xu at Weizmann Inst  <dong.dark@gmail.com>",
  "eventId": "GRB 110915A"
}