{
  "bibcode": "2021GCN.31140....1Z",
  "body": "Z.P. Zhu (NAOC, HUST), X. Liu, S.Y. Fu, S.Q. Jiang, D. Xu (NAOC), X. Gao \n(Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:\n\nWe observed the field of Swift GRB 211129A (Gropp et al. GCN Circ. \n31136) using the NEXT-0.6m telescope located at Nanshan, Xinjiang, \nChina. We obtained 18x120 s frames in the Sloan r-band, starting at \n12:38:57 UT on 2021-11-29, i.e., 2.8 hr after the BAT trigger.\n\nNo optical source is detected at the Enhanced Swift/XRT position (Goad \net al. GCN Circ. 31139) in our stacked image, down to a limiting \nmagnitude of r~21.2, calibrated with the nearby PanSTARRS field.",
  "circularId": 31140,
  "createdOn": 1638195852000,
  "email": "dxu@nao.cas.cn",
  "subject": "GRB 211129A: Nanshan/NEXT optical upper limit",
  "submitter": "Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>",
  "eventId": "GRB 211129A"
}