{
  "bibcode": "2007GCN..6554....1I",
  "body": "T. Ishimura, Y. Yatsu, T. Shimokawabe, N. Vasquez, Y.kudo, and \nN. Kawai (TokyoTech) report on behalf of the MITSuME collaboration:\n\nWe observed the error box of GRB070616 (Starling et al. GCN 6542)\nwith the 3-color 50cm MITSuME Telescope at Akeno, Japan starting\nat 16:52:26 June 16 UT, 22m53s after the trigger under a poor sky\ncondition with clouds and a high airmass.\nIn the co-added images of Ic, Rc, and g' bands, we did not detect\nany afterglow candidate 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    Exposure   Mag (3-sigma upper limit)\n-----------------------------------------------------------------\ng'       16:52:26     18:03:39    58 x 60 s    17.8\nRc       16:52:26     18:03:39    58 x 60 s    19.1\nIc       16:52:26     18:03:39    58 x 60 s    18.6\n-----------------------------------------------------------------",
  "circularId": 6554,
  "createdOn": 1182148595000,
  "email": "nkawai@hp.phys.titech.ac.jp",
  "subject": "GRB070616: Optical Observation by MITSuME Akeno",
  "submitter": "Nobuyuki Kawai at Tokyo Tech  <nkawai@hp.phys.titech.ac.jp>",
  "eventId": "GRB 070616"
}