{
  "bibcode": "2009GCN..9892....1N",
  "body": "K. Nishimoto, T. Sako, and D. Suzuki (STE Lab, Nagoya Univ.)\non behalf of the MOA Collaboration  report:\n\nWe searched for an optical afterglow of GRB090904B (GCN9881, V. D'Elia\net al.) starting from 07:34:56.9 UT on 2009 Sep 4 (6 hours after the\nburst) with the MOA-II 1.8m telescope at Mt.John observatory in New Zealand.\nIn a single image of a 60 sec exposure with a wideband Red filter\n(center wavelength ~ 750nm and FWHM ~ 250nm), we did not find any object\nwithin the error circle of the Swift XRT source position (GCN 9887),\nexcept a USNO-B1.0 catalog star, 0647-0516939, which has I mag=15.10 and\nthe separation of 1.8 arcsec from the center of the position.\n\nQuick estimation of the limiting magnitude is >20.5 calibrated by using\nUSNO-B1.0 catalog.",
  "circularId": 9892,
  "createdOn": 1252078148000,
  "email": "nishimo@stelab.nagoya-u.ac.jp",
  "subject": "GRB 090904B: MOA-II Optical observation",
  "submitter": "Kenta Nishimoto at Nagoya U/MOA-II  <nishimo@stelab.nagoya-u.ac.jp>",
  "eventId": "GRB 090904B"
}