{
  "bibcode": "2020GCN.27104....1X",
  "body": "D. Xu, Z.P. Zhu, X. Liu, B.Y. Yu, Y. Ma (NAOC), X. Gao (Urumqi No.1 \nSenior High School) report:\n\nWe observed the field of GRB 200216B (D'Avanzo et al., GCN 27102) using \nthe NEXT 0.6m optical telescope located at Nanshan, Xinjiang, China. \nObservations automatically started at 13:33:46 UT on 2002-02-16, i.e., \n73 s after the BAT trigger. We obtained 3x40 s, 4x60 s, 3x90 s and \nonging 200 s frames in the Sloan r-filter. The altitude for the GRB and \nthe weather has been improving.\n\nNo optical afterglow is detected in our images at the XRT position \n(D'Avanzo et al., GCN 27102) down to a limiting magnitude of r~20.0.\n\nMeanwhile, we note that there exists a very marginally detected blob \n(thus noise fluctuation not ruled out yet), extended and being \npositionally consistent with the XRT position both in PanSTAR r-band \nfield, centred at coordinates: R.A. (J2000) = 10:41:44.23, Dec. (J2000) \n= +19:28:33.18. The source would be of r~23 in depth, and might be the \nhost galaxy of the GRB. Deep imaging would identify the nature of the blob.",
  "circularId": 27104,
  "createdOn": 1581865781000,
  "email": "dxu@nao.cas.cn",
  "subject": "GRB 200216B: Nanshan/NEXT early optical upper limit and possible host galaxy",
  "submitter": "Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>",
  "eventId": "GRB 200216B"
}