{
  "bibcode": "2020GCN.29203....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 201229A (Sbarufatti et al., GCN 29192) \nusing the NEXT-0.6m telescope located at Nanshan, Xinjiang, China. We \nobtained 5 x 200 s frames in the Sloan r-band, starting at 19:52:23 UT \non 2020-12-29, i.e., 8.88 hr after the burst.\n\nNo optical source is detected in our stacked image at the Swift/UVOT \nposition (Sbarufatti et al., GCN 29192), down to a upper limiting of \nr~20.4, calibrated with the nearby PanSTARRS field.",
  "circularId": 29203,
  "createdOn": 1609300423000,
  "email": "dxu@nao.cas.cn",
  "subject": "GRB 201229A: Nanshan/NEXT optical upper limit",
  "submitter": "Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>",
  "eventId": "GRB 201229A"
}