{
  "bibcode": "2017GCN.22157....1M",
  "body": "J. Mao, C.-J. Wang and J.-M. Bai (YNAO) report:\n\n\nWe observed the field of GRB 171123A (Evans et al., GCN 22148) with the 2.4-meter optical telescope at Gao-Mei-Gu (GMG) station of Yunnan Observatories. Observations began from 21:02:44 UT, about 6.8 hours after the trigger. We did not detect any source within the X-ray afterglow position error circle (Goad et al. GCN 22150), down to a limit of R~21.6 mag.",
  "circularId": 22157,
  "createdOn": 1511528139000,
  "email": "jirongmao_obs@ynao.ac.cn",
  "subject": "GRB 171123A: GMG observation limit",
  "submitter": "Jirong Mao at Yunnan Obs  <jirongmao_obs@ynao.ac.cn>",
  "eventId": "GRB 171123A"
}