{
  "bibcode": "2021GCN.29401....1F",
  "body": "S.Y. Fu (NAOC), Z.P. Zhu (HUST,NAOC), X. Liu, D. Xu (NAOC), X. Gao \n(Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:\n\nWe observed the field of GRB 210205A (Dichiara et al., GCN 29397) using \nthe NEXT-0.6m telescope located at Nanshan, Xinjiang, China. We obtained \n3x40 s, 4x60 s, 12x90 s frames in the Sloan r-band, starting at 12:09:46 \nUT on 2021-02-05, i.e., 58.5 min after the BAT trigger.\n\nNo optical source is detected in our stacked image at the enhanced XRT \nposition (Osborne et al., GCN 29399), down to a limiting magnitude of \nr~19.9, calibrated with the nearby PanSTARRS field.",
  "circularId": 29401,
  "createdOn": 1612542003000,
  "email": "dxu@nao.cas.cn",
  "subject": "GRB 210205A: Nanshan/NEXT optical upper limit",
  "submitter": "Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>",
  "eventId": "GRB 210205A"
}