{
  "bibcode": "2006GCN..5977....1I",
  "body": "T. Ishimura, Y. Yatsu, T. Shimokawabe, N. Vasquez, and N. Kawai (Tokyo\nTech) report on behalf of the MITSuME collaboration:\n\nWe observed the error box of GRB061222B (Racusin et al., GCN 5957)\nwith the 3-color 50cm MITSuME Telescope at Akeno, Japan starting at\n12:52:28 UT, 8.7 hours after the trigger.   \nIn the co-added images of Ic, Rc, and g' bands, we did not detect\nthe afterglow (Berger, GCN 5956).  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       12:52:28    13:29:50     60s * 29       18.3\nRc       12:52:28    13:29:50     60s * 29\t 19.7\ng'       12:52:28    13:29:50     60s * 29\t 19.4\n-----------------------------------------------------------------",
  "circularId": 5977,
  "createdOn": 1166974367000,
  "email": "nkawai@hp.phys.titech.ac.jp",
  "subject": "GRB 061222B: MITSuME Akeno optical upper limits",
  "submitter": "Nobuyuki Kawai at Tokyo Tech  <nkawai@hp.phys.titech.ac.jp>",
  "eventId": "GRB 061222B"
}