{
  "bibcode": "2010GCN.11146....1S",
  "body": "D. Suzuki, K. Omori, N. Miyake,  S. Kobara, H. Naito and T. Sako (STE Lab, Nagoya Univ.),\nT. Saito (Tokyo Metropolitan College of Industrial Technology)\nand K. Wada (Konan Univ.) on behalf of the MOA Collaboration  report:\n\nWe searched for an optical afterglow of GRB 100823A (GCN 11135, Mangano et al.)\nstarting from 17:30:34 UT on 2010 Aug 23 (5 minutes after the burst)\nwith the MOA-II 1.8m telescope at Mt.John observatory in New Zealand.\nIn a single image of a 60sec exposure with a wideband Red filter (center\nwavelength ~ 750nm and FWHM ~ 250nm), we found an object not found in the USNO-B1.0 catalog\nwithin the error circle of the Swift XRT source position (GCN 11136 Goad et al.).\nThe position coincides with the source C (GCN 11145, Levan et al.) and \nthe magnitude is estimated to be I=17.1mag.\n\nAdditionally, we obtained a second epoch of observation of GRB 100823A \nstarting from 14:59:16 UT on 2010 Aug 24 (approximately 21.5 hours after the burst).\nIn a single image of a 300sec exposure with a wideband Red filter,\nwe detected source A (GCN 11138, Levan et al.) with magnitude I=21.3mag\n,but we did not detect the source C in this epoch.\n\nThis photometry were done by using the DoPhot and calibrated against the\nUSNO-B1.0 catalog stars, and not corrected for the Galactic extinction.",
  "circularId": 11146,
  "createdOn": 1282740105000,
  "email": "dsuke@stelab.nagoya-u.ac.jp",
  "subject": "GRB100823A : MOA optical observation",
  "submitter": "Suzuki Daisuke at MOA-II  <dsuke@stelab.nagoya-u.ac.jp>",
  "eventId": "GRB 100823A"
}