{
  "bibcode": "2016GCN.18890....1M",
  "body": "E. Mazaeva (IKI),  E. Chornaya  (UAFO),  A. Matkin (UAFO, ISON), A. \nVolnova (IKI), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of \nlarger GRB follow-up collaboration:\n\nWe observed the field of the GRB 160104A (Melandri  et al., GCN  18815) \nwith SANTEL-650 (0.65m)  telescope of UAFO/ISON-Ussuriysk observatory \nstarting on 2016-01-04 (UT) 12:21:43. We obtained 60 unfiltered images \nof 60 s exposure. We clearly detect optical afterglow (Guidorzi et al., \nGCN  18816) and preliminary photometry of a combined image is following\n\nDate       UT start  t-T0  Filter  Exp.    OT   OT_err U_limit (3sigma)\n                      (mid, days)   (s)\n\n2016-01-04 12:21:43  0.0635 none    59*60  20.45 0.12  22.3\n\n\nThe photometry is based on nearby USNO-B1.0  stars:\nUSNO-B1.0_id R2\n1013-0049708 15.14\n1013-0049721 14.90\n1013-0049703 16.30\n1013-0049714 17.12\n\nWe also note the presence of a source  11\" South-East of  m = 20.60 +/- \n0.15.",
  "circularId": 18890,
  "createdOn": 1453152020000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 160104A: ISON-Ussuriysk optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 160104A"
}