{
  "bibcode": "2021GCN.30277....1X",
  "body": "L. P. Xin (NAOC), X. Li (THU),  Y. L. Qiu(NAOC), J. Y. Wei(NAOC),  \nJ. Wang(GXU),  L. H. Li (NAOC),  C. Wu(NAOC),  E. W. Liang(GXU), \nX. H. Han (NAOC), A. Y. Zhou (NAOC) and J. S. Deng(NAOC) report:\n\nWe began to observe GRB 210619B (Swift detection: D'Avanzo et al., GCN\n30261; GECAM detection: Zhao et al., GCN 30264; Fermi-LAT detection: \nAxelsson et al., GCN 30270; Konus-Wind detection: Svinkin et al., GCN 30276; \nAfterglow detections: Lipunov et al., GCN 30259; D'Avanzo et\nal., GCN 30261; Lipunov et al., GCN 30262; Jelinek et al., GCN 30263; \nKong, GCN 30265; Pellegrin et al., GCN 30268; Perley, GCN 30271; \nZheng & Filippenko, GCN 30273; Redshift: de Ugarte Postigo, GCN 30272, \nBlazek et al., GCN 30274; Kann et al., 30275) with Xinglong TNT telescope, \nChina, at 15:23:44 (UT), 20th. June. 2021,  about 14.43 hours after the burst, \n\nA series of  R and B band images were obtained. \nThe afterglow is clear detected in our single image with a magnitude of 19.0 mag \nin R band comparing to several nearby USNO B1.0 stars.\n\nObservations are still continuing. \n\nWe acknowledge the excellent support from Xinglong staff YuGuang Sun. \n\nThe message may be cited.",
  "circularId": 30277,
  "createdOn": 1624205615000,
  "email": "xlp@nao.cas.cn",
  "subject": "GRB 210619B: Xinglong TNT optical observations",
  "submitter": "Liping Xin at NAOC, SVOM  <xlp@nao.cas.cn>",
  "eventId": "GRB 210619B"
}