{
  "bibcode": "2012GCN.13912....1V",
  "body": "A. Volnova (SAI MSU, IKI), Moskvitin (SAO RAS), V. Rumyantsev (CrAO),\nA. Pozanenko (IKI)\n\n\nWe observed the field of the Swift GRB 121011A (Racusin et al., GCN\n13845) with ZTSh telescope of CrAO on Oct. 15 between (UT) 17:36 and\n18:54 under good weather condition with mean seeing of about 1.5\narcsec. We took 70 frames with exposure of 60 seconds in filter R.  In\na stacked image we do not detect any source within enhanced XRT error\ncircle (Evans et al., GCN 13850).\n\nWe also observed the field of this GRB with Zeiss-1000 telescope of\nSAO RAS on Oct. 17 between (UT) 17:45 and 18:38 under good weather\nconditions with mean seeing of about 2.4 arcsec. We took 12 frames\nwith exposure of 200 seconds. On a stacked image we do not detect any\nsource either. The photometry based on a USNO-B1 star #1310-0279773\n(R1 = 17.84; same\nas calibration in Fynbo et al., GCN Circ. 13856; Malesani et al., GCN\n13853) is following:\n\nT0+        Filter,  Exposure, OT,  UL (3 sigma),  Telescope\n(days)               (s)\n\n4.292      R       70x60        n/d   23.5                ZTSh\n6.294      R       12x200      n/d   22.3                Zeiss-1000",
  "circularId": 13912,
  "createdOn": 1351378928000,
  "email": "alinusss@gmail.com",
  "subject": "GRB 121011A: optical observations",
  "submitter": "Alina Volnova at SAI MSU  <alinusss@gmail.com>",
  "eventId": "GRB 121011A"
}