{
  "bibcode": "2016GCN.19980....1M",
  "body": "E. Mazaeva (IKI), I. Reva (Fesenkov Astrophysical Institute), A. Kusakin \n(Fesenkov Astrophysical Institute),  A. Volnova (IKI), A. Pozanenko \n(IKI) report on behalf of larger GRB follow-up collaboration:\n\nWe observed the field of GRB 161004A  (Evans  et al., GCN 19979)  with \nZeiss-1000 (East) 1-m telescope of Tien Shan Astronomical Observatory. \nWe obtained several images in R filter starting on Oct. 04 (UT) \n13:36:52.  In the XRT error circle we do not detect any new object. Wa \ndo not detect also candidate afterglow (Evans  et al., GCN 19979). \nPreliminary photometry of a combined image is following\n\nDate       UT start   t-T0   Filter   Exp.  OT     Err.  UL\n                       (mid, days)     (s)\n2016-10-04 13:36:52 0.04321  R       15*180 n/d    n/d   21.9\n\nPhotometry is based on nearby SDSS-DR9 stars (Lupton transformations):\nSDSS-DR9_id         R(Lupton)\nJ173243.09-005731.3 17.04\nJ173250.91-005842.7 16.77\nJ173251.94-005803.2 15.75\nJ173253.88-005801.6 15.62\nJ173253.02-005938.3 16.02\nJ173232.00-005640.3 16.34\nJ173227.11-005646.8 16.41\nJ173227.04-005816.8 16.51\nJ173227.48-005856.9 16.62\nJ173236.27-010018.1 16.96\nJ173241.54-005823.1 16.26\n\nA finding chart can be found at \nhttp://grb.rssi.ru/GRB161004A/GRB161004A_TSHAO_161004_XRT_UVOT.png",
  "circularId": 19980,
  "createdOn": 1475603081000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 161004A: TSHAO optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 161004A"
}