{
  "bibcode": "2023GCN.33616....1L",
  "body": "T.H. Lu (NAOC), Z.P. Zhu (NAOC, HUST), S.Y. Fu, S.Q. Jiang, X. Liu, D. \nXu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:\n\nWe observed the field of GRB 230414B detected by Swift (A. D'Ai et al., \nGCN 33612) using the HMT-0.5m telescope located at Nanshan, Xinjiang, \nChina. Observations started at 16:19:34 UT on 2023-04-14, i.e., 313s \nafter the Swift/BAT trigger, and a series of 20 s, 40 s, 60 s, 90 s \nexposures have been obtained without any filter. Observations are still \nongoing.\n\nWe detected an uncatalogued and varying optical transient (OT) at \ncoordinates\n\nR.A. (J2000) = 12:04:22.70\nDec.(J2000) = +53:09:16.38\n\nwith an uncertainty of ~ 0.5 arcsec, and it has m(r) ~19.3 mag in the \nco-added image from the initial exposures, calibrated with the nearby \nPanSTAR field in the Sloan r-filter. We thus think that the OT is the \noptical afterglow of the burst.",
  "circularId": 33616,
  "createdOn": 1681493169000,
  "email": "dxu@nao.cas.cn",
  "subject": "GRB 230414B: Nanshan/HMT optical afterglow detection",
  "submitter": "Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>",
  "eventId": "GRB 230414B"
}