{
  "bibcode": "2017GCN.20886....1M",
  "body": "E. Mazaeva (IKI), A. Pozanenko (IKI), A. Kochergin (UAFO), A. Volnova \n(IKI),  E. Chornaya  (UAFO),   A. Matkin (UAFO, ISON),  I. Molotov \n(KIAM)  report on behalf of larger GRB follow-up collaboration:\n\nWe observed the field of the GRB 170317A (LaPorte et al., GCN  20885) \nwith SANTEL-650 (0.65m)  telescope of UAFO/ISON-Ussuriysk observatory \nstarting on March, 17 (UT) 10:20:37. We obtained series of unfiltered \nimages of 60 s exposure. In a first combined images we  detected optical \nafterglow (LaPorte et al., GCN  20885). Preliminary photometry of some \ninitial combined image  is following\n\nDate       UT start  t-T0   Filter  Exp.  OT     err  UL (3sigma)\n                      (mid, days)    (s)\n\n2017-03-17 10:20:37  0.0321 none   20*60  18.95  0.08 21.5\n\nIn comparison with early reported photometry (LaPorte et al., GCN \n20885) the OT is faded, and we confirm the afterglow of the GRB 170317A.\n\nPhotometry is based on nearby USNO-B1.0 stars\n\nUSNO_B1_id   R2\n1405-0167482 15.08\n1405-0167474 15.43\n1405-0167493 16.10\n1405-0167484 16.14\n1404-0169177 15.93\n1405-0167639 15.62\n1405-0167631 15.69",
  "circularId": 20886,
  "createdOn": 1489756010000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 170317A: ISON-Ussuriysk aferglow confirmation",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 170317A"
}