{
  "bibcode": "2019GCN.23777....1M",
  "body": "J. Mao, L.-F. Xing, M. Xiao, J.-M. Bai (YNAO) report: \n\n\nWe observed the field of GRB 190123A (D'Ai et al. GCN Circ. 23769) with the 2.4-meter optical telescope at Gao-Mei-Gu (GMG) station of Yunnan Observatories. The observation began at UT 13:15:51, 23, Jan, 2019, about 1 hour after the trigger. We did not detect any source within the Swift-XRT error circle down to a magnitude of R~22.7.",
  "circularId": 23777,
  "createdOn": 1548309195000,
  "email": "jirongmao_obs@ynao.ac.cn",
  "subject": "GRB 190123A: GMG observational limit",
  "submitter": "Jirong Mao at Yunnan Obs  <jirongmao_obs@ynao.ac.cn>",
  "eventId": "GRB 190123A"
}