{
  "body": "S.Q. Jiang, Z.P. Zhu, S.Y. Fu, J. An, X. Liu, T.H. Lu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:\n\nWe observed the optical afterglow of GRB 231111A detected by Swift (Melandri et al., GCN 34981) using the HMT-0.5m telescope located at Nanshan, Xinjiang, China. Observations started at 14:18:35 UT on 2023-11-11, i.e., 75 s after the Swift/BAT trigger, and we obtained a serise of 3x20, 3x40, 4x60, 4x90, 4x120, 4x200 s frames without any filter.\n\nThe optical afterglow has been decaying during our observations from m(r)~16.04 mag @85 s post-burst to m(r)~18.77 mag @2734 s post-burst, roughly in a powerlaw with a decay index of ~ -0.7, calibrated with the nearby PanSTAR field in the Sloan r-filter and the magnitude is not corrected for Galactic extinction.\n\n\n\n",
  "submitter": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
  "createdOn": 1699720486733,
  "circularId": 34982,
  "eventId": "GRB 231111A",
  "bibcode": "2023GCN.34982....1J",
  "subject": "GRB 231111A: Nanshan/HMT optical observations",
  "submittedHow": "email"
}