{
  "bibcode": "2017GCN.22092....1M",
  "body": "E. Mazaeva (IKI),  A. Kusakin (Fesenkov Astrophysical Institute), A. \nPozanenko (IKI),  I. Reva (Fesenkov Astrophysical Institute),    A. \nVolnova (IKI)  report on behalf of larger GRB follow-up collaboration:\n\nWe observed the field of the Swift  GRB 170822A   (Ukwatta et al.,\nGCN  22082) with Zeiss-1000 1-m telescope of Tien Shan Astronomical \nObservatory starting on Nov., 02 (UT) 15:47:45.  We took several images \nin R-filter.  Within enhanced XRT error circle  (Osborne et al., GCN \n22084) we do not detect  any  object.  Preliminary  photometry of the \nafterglow is following.\n\nDate       UT start   t-T0    Filter Exp.  OT     Err. UL\n                      (mid, days)     (s)             (3 sigma)\n\n\n2017-11-02 15:47:45  0.04377  R    30*120  n/d    n/d  20.1\n\n\nPhotometry is based on nearby USNO-B1.0 stars R2 magnitudes\nUSNO-B.1_id  R2\n1124-0422739 16.70\n1124-0422527 16.20\n1124-0422440 15.76",
  "circularId": 22092,
  "createdOn": 1509742161000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 171102B: TShAO optical upper limit",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 171102B"
}