{
  "bibcode": "2023GCN.33534....1L",
  "body": "T.H. Lu, S.Q. Jiang, S.Y. Fu, X. Liu (NAOC), Z.P. Zhu (NAOC, HUST), D. \nXu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:\n\nWe observed the field of GRB 230328B detected by Swift (Gropp et al., \nGCN 33527),using the NEXT-0.6m optical telescope located at Nanshan, \nXinjiang, China. Observations started at 16:39:57 UT on 2023-03-28, \ni.e., 1.75 hr after the Swift/BAT trigger.\n\nThe previously reported optical afterglow (e.g., Pankov et al., GCN \n33528; Belkin et al., GCN 33530) is marginally detected in our stacked \nimage. Preliminary photometry of the afterglow has r ~ 19.1 mag, \ncalibrated by nearby PanSTARRS stars.",
  "circularId": 33534,
  "createdOn": 1680061519000,
  "email": "dxu@nao.cas.cn",
  "subject": "GRB 230328B: Nanshan/NEXT optical upper limit",
  "submitter": "Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>",
  "eventId": "GRB 230328B"
}