{
  "bibcode": "2016GCN.19201....1M",
  "body": "E. Mazaeva (IKI),  A. Volnova (IKI),  E. Klunko (ISTP),  I. Korobtsev \n(ISTP),  A. Pozanenko (IKI) report on behalf of larger GRB follow-up \ncollaboration:\n\nWe observed the field of the GRB 160313A (D'Ai et al., GCN  19171) with \nAZT-33IK telescope of Sayan observatory (Mondy)  starting on March, 13 \n(UT) 16:39:40.  We do not detect any source within enhanced Swift-XRT \nposition (Goad et al., GCN 19174). Preliminary photometry  of  the \ncombined image is following\n\nDate        UT start   t-T0    Filter  Exp.    UpperLimit (3 sigma)\n                       (mid, days)      (s)\n\n2016-03-13  16:39:40  0.60586  R       30*120  23.6\n\nPhotometry is based on nearby SDSS-DR9 stars, Lupton transformations into R.\n\nThe nearest source to the enhanced XRT position is 5.5 arcsec East, in \ncoordinates (J2000) 12:15:11.86 +57:17:00.0 with uncertainty of 0.5 \narcsec in both coordinates. The source magnitude is R=23.3+/-0.2. The \nsource is not presented in SDSS-DR9 but barely visible in SDSS r-image.",
  "circularId": 19201,
  "createdOn": 1458159735000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 160313A: Mondy optical upper limit",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 160313A"
}