{
  "bibcode": "2011GCN.12491....1M",
  "body": "A. S. Moskvitin, V. N. Komarova, V. V. Sokolov and T. N. Sokolova\n(SAO RAS GRB follow-up team) report:\n\nThe field of GRB 111022B (Holland et al., GCN#12472) was observed\nwith the 6-m BTA/Scorpio on October, 23, 2011. We obtained 3 x 180 sec.\nframes in the Rc band and 25 x 120 sec. in the Ic band.\nObservations in Rc began at 00:40:10 (7.5 hours after the trigger),\nended at 00:50:21 UT; in Ic began at 01:23:11 UT (8.2 hours after the\ntrigger), ended at 02:22:40 UT. Conditions were clear with a seeing\nof about 1\".2 (FWHM of stellar objects in the Ic co-added image).\n\nThe possible optical counterpart is clearly detected in the Ic band\nwithin the 1\".5 XRT error circle (according to\nhttp://www.swift.ac.uk/xrt_positions/) at the coordinates:\nR.A.  (J2000) = 07:15:51.56\nDecl. (J2000) = +49:41:01.7\nwith the uncertainty 0\".2.\n\nThe object magnitude is I = 23.6 +/- 0.3 as compared to USNO-B1.0 Imag\nof six nearby stars. The high error is due to calibration, the 3-sigma\nlimit of the Ic co-added image is about 24.7. We do not detect the object\nin the Rc-band down to the 3-sigma level limiting magnitude of about 24.3.\nThe Ic image can be found at\nftp://ftp.sao.ru/pub/grb/GRB111022B/GRB111022B_BTA.jpg\n\nOur results are in agreement with the previously reported NOT observations\n(Vreeswijk et al., GCN#12479) and do not contradict the idea of a high\nredshift burst according to Gemini infrared observations (Levan et al.,\nGCN#12481).\n\nWe are grateful to T. A. Fatkhullin\nand the BTA staff for the help in observations.",
  "circularId": 12491,
  "createdOn": 1319485063000,
  "email": "sokolov@sao.ru",
  "subject": "GRB 111022B: BTA Optical Observations",
  "submitter": "Vladimir Sokolov at SAO RAS  <sokolov@sao.ru>",
  "eventId": "GRB 111022B"
}