{
  "bibcode": "2019GCN.23788....1X",
  "body": "D. Xu, Z.P. Zhu (NAOC) report on behalf of a larger collaboration\n\nWe observed the field of GRB 190123A (D'Ai et al., GCN Circ. 23769) with \nthe robotic NEXT-0.6m telescope located at Nanshan, Xinjiang, China. We \nobtained 3x40s, 4x60s, 3x90s R-band frames, starting at 12:20:56 UT on \n2019-01-23, i.e., 103 sec after the BAT trigger.\n\nNo optical afterglow consistent with the XRT position (Beardmore et al. \nGCN Circ. 23771) is detected in the stacked image, download a limiting \nmagnitude of R~19.5, calibrated with the USNO-B1 catalog.",
  "circularId": 23788,
  "createdOn": 1548349919000,
  "email": "dxu@nao.cas.cn",
  "subject": "GRB 190123A: NEXT-0.6m optical limit",
  "submitter": "Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>",
  "eventId": "GRB 190123A"
}