{
  "bibcode": "2017GCN.22195....1M",
  "body": "J. Mao, X. Ding and J.-M. Bai (YNAO) report:\n\n\nWe observed the field of GRB 171205A (D'Elia et al., GCN 22177) with the 2.4-meter optical telescope at Gao-Mei-Gu (GMG)\nstation of Yunnan Observatories, beginning from 22:04:14 UT, 6th, Dec., 2017, about 1.6 days after the trigger. We still clearly detected the optical counterpart. Some preliminary results were roughly estimated as B~20.7, V~20.0, and R~20.7 mag. The brightness might be underestimated due to poor seeing. Although the magnitudes we measured have large uncertainty, we compare our observation of the first night (Mao et al. GCN 22186), and it seems that the source has no significant fading evidence.",
  "circularId": 22195,
  "createdOn": 1512630013000,
  "email": "jirongmao_obs@ynao.ac.cn",
  "subject": "GRB 171205A: GMG observations (2nd night)",
  "submitter": "Jirong Mao at Yunnan Obs  <jirongmao_obs@ynao.ac.cn>",
  "eventId": "GRB 171205A"
}