{
  "bibcode": "2019GCN.25524....1Y",
  "body": "B.Y. Yu, X. Liu, D. Xu, Z.P. Zhu (NAOC), J.H. Liu (XAO), X. Gao (Urumqi \nNo.1 Senior High School), Z.B. Zhang (XJTS) report:\n\nWe observed the field of GRB 190828B (Dichiara et al., GCN 25517) using \nthe Half-Meter Telescope (HMT-0.5m) located at Dabancheng, Xinjiang, \nChina. We obtained 5x60 s unfiltered frames, started at 13:56:32 UT on \n2019-08-28, i.e., 56.5 min after the burst.\n\nNo optical source is detected at the XRT position (Dichiara et al., \nGCN25517) in our stacked image, down to a limiting magnitude of R~17.8, \ncalibrated with the nearby SDSS field.",
  "circularId": 25524,
  "createdOn": 1567009866000,
  "email": "dxu@nao.cas.cn",
  "subject": "GRB 190828B: Dabancheng-0.5m optical upper limit",
  "submitter": "Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>",
  "eventId": "GRB 190828B"
}