{
  "bibcode": "2006GCN..5979....1I",
  "body": "T. Ishimura, Y. Yatsu, T. Shimokawabe, N. Vasquez, and N. Kawai (TokyoTech)\nreport on behalf of the MITSuME collaboration:\n \nWe observed the error box of GRB061222A (Grupe et al., GCN 5954)\nwith the 3-color 50cm MITSuME Telescope at Akeno, Japan starting \nat 8:48:53 UT, 5.3 hours after the trigger.   \nIn the co-added images of Ic, Rc, and g' bands, we did not detect\nany new source in the XRT error circle.  The 3-sigma limiting\nmagnitudes based on USNO-B1.0 (I-band) and NOMAD (R-band,g'-band)\nstars are following.\n\nFilter   start time   end time    Exp(s)    Mag (3-sigma upper limit)\n-----------------------------------------------------------------\nIc        8:48:53    09:32:23     60s * 36         19.6 \nRc        8:48:53    09:32:23     60s *\t36\t   20.4 \ng'        8:48:53    09:32:23     60s * 36\t   20.6\n-----------------------------------------------------------------",
  "circularId": 5979,
  "createdOn": 1167002383000,
  "email": "nkawai@hp.phys.titech.ac.jp",
  "subject": "GRB 061222A: MITSuME Akeno optical upper limits",
  "submitter": "Nobuyuki Kawai at Tokyo Tech  <nkawai@hp.phys.titech.ac.jp>",
  "eventId": "GRB 061222A"
}