{
  "bibcode": "2019GCN.23636....1Z",
  "body": "Z.P. Zhu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.H. \nLiu (XAO) report:\n\nWe monitored the optical afterglow of GRB 190106A (e.g., Sonbas et al., \nGCN 23615) using the NEXT-0.6m telescope located at Nanshan, Xinjiang, \nChina and the Xinglong-2.16m telescope.\n\nThe observations of NEXT-0.6m started at 13:57:21 UT on 2019-01-06 \n(i.e., 0.38 hr post-burst) and ended at 19:48:25 UT on 2019-01-06 (i.e., \n5.97 post-burst), with a series of 60s, 90s, 120s, 200s, and 300s \nexposures in the R-band. The afterglow had R=16.9+/-0.1 mag at the \nbeginning, and rather smoothly decayed to R=19.1+/-0.1 mag at the end, \ncalibrated with nearby SDSS stars.\n\nThe Xinglong-2.16m observations were carried out at 12:54:46 UT on \n2019-01-07, i.e, 23.33 hr post-burst, with 5x360s in the R-band. The \nafterglow has decayed to R=19.9+/-0.1 mag, calibrated with the same \nreference stars.\n\nThe joint NEXT-0.6m and Xinglong-2.16m dataset shows that so far the \nafterglow R-band lightcurve has been decaying, and following a single \npowerlaw of F ~ t^-alpha, where alpha~0.64.",
  "circularId": 23636,
  "createdOn": 1546879715000,
  "email": "dxu@nao.cas.cn",
  "subject": "GRB 190106A: NEXT-0.6m and Xinglong-2.16m photometric single powerlaw decay",
  "submitter": "Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>",
  "eventId": "GRB 190106A"
}