{
  "bibcode": "2017GCN.22246....1M",
  "body": "E. Mazaeva (IKI), A. Pozanenko (IKI), I. Reva (FAPHI), M. Krugov \n(FAPHI), A. Kusakin (FAPHI), A. Volnova (IKI)   report on behalf of \nlarger GRB follow-up collaboration:\n\nWe observed the field of GRB 171212A (Tohuvavohu  et al., GCN 22243) \nwith Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory \nstarting on Dec. 12 (UT) 12:21:15. We took several images in R-filter. \nWithin enhanced Swift-XRT error circle   (Evans et al. GCN 22245)  we do \nnot detect any object. Preliminary photometry of initial combined images \nis following.\n\nDate        UT start    t-T0  Filter Exp.   OT   Err. ULim\n                      (mid, days)     (s)\n\n2017-12-12  12:21:15 0.01896  R      3*120  n/d  n/d  20.0\n2017-12-12  12:21:15 0.02728  R     13*120  n/d  n/d  21.1\n\n\nThe photometry is based on several nearby USNO-B1.0 stars\n\nUSNO-B.1_id  R2\n1105-0415742 17.60\n1105-0415769 17.54\n1105-0415805 16.38\n1106-0408959 17.07\n1105-0415666 16.91",
  "circularId": 22246,
  "createdOn": 1513106326000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 171212A/Swift J1935.7+2036: TSHAO optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 171212A"
}