{
  "bibcode": "2011GCN.12321....1V",
  "body": "Volnova (SAI MSU), E. Litvinenko (UBAI), I. Molotov (Institute of\nApplied Mathematics), A. Pozanenko (IKI)\n\nWe observed the field of the Swift GRB 110820A (Troja et al., GCN\n12288) with 40-cm telescope ORI-40 of Kitab ISON observatory on Aug.\n20 starting on 17:48:45 UT, i.e. 15.5 minutes after the BAT trigger.\nOn the stacked image we do not detect any source within the enhanced\nXRT error box (Beardmore et al., GCN 12291). The photometry is based\non the USNO B1.0 star USNO-B1.0 1603-0160240, (J2000) RA = 22:52:56.89\nDec = +70:18:37.5, assuming  R 17.19:\n\n Tstart UT, T0+,        Filter, Exposure, OT, Upper Limit (3 sigma)\n                 (mid, d)             (s)\n\n 17:48:45   0.01072   R       5*120        n/d  19.2\n 17:48:45   0.02734   R       28*120      n/d  19.6",
  "circularId": 12321,
  "createdOn": 1314973984000,
  "email": "alinusss@gmail.com",
  "subject": "GRB 110820A: optical upper limit",
  "submitter": "Alina Volnova at SAI MSU  <alinusss@gmail.com>",
  "eventId": "GRB 110820A"
}