{
  "bibcode": "2021GCN.29494....1H",
  "body": "Y.-D. Hu, E. Fernandez-Garcia, A. J. Castro-Tirado, M.D. Caballero-Garcia, M. A. Castro Tirado (IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco (Univ. de Malaga), S. Guziy (Univ. of Nikolaev) and D. R. Xiong, Y. F. Fan, J. M. Bai, C. J. Wang, Y. X. Xin, X. H. Zhao (Yunnan Observatories of CAS) on behalf of a larger collaboration, report:\r\n\r\nFollowing the detection of GRB 210212A by Swift (Troja et al. GCNC 29487), the 0.6m BOOTES-4/MET robotic telescope at Lijiang Astronomical Observatory (China) started to gather images after the twilight as soon as it was possible. No new source is detected within the Swift/XRT enhanced position (Beardmore et al. GCNC 29489) down to 19.7 mag in the co-added images (5x60 s, clear filer) starting at 13:11 UT on Feb 12. The non-detection is consistent with the limit reported by Swift/UVOT (Troja et al. GCNC 29487).\r\n\r\nWe thank the staff at Lijiang observatory for their excellent support.",
  "circularId": 29494,
  "createdOn": 1613144439000,
  "email": "huyoudong072@hotmail.com",
  "subject": "GRB 210212A: BOOTES-4/MET optical upper limit",
  "submitter": "Youdong HU at IAA-CSIC  <huyoudong072@hotmail.com>",
  "eventId": "GRB 210212A"
}