{
  "bibcode": "2007GCN..6794....1I",
  "body": "T. Ishimura, T. Shimokawabe, N. Vasquez, Y. Yatsu, Y. Kudou and\nN. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:\n \nWe observed the field of GRB070917 (Cummings et al. GCN 6791)\nwith the 3-color 50cm MITSuME Telescope at Akeno, Japan starting \nat 09:46:58 UT, 2.2 hours after the trigger.\nAlthough the observation was performed in three bands (Ic, Rc, and g'),\nonly the data in Ic band are usable for reliable comparison to \ncatalogued sources because of the poor sky condition in the dusk \nwith thin clouds.\n\nWe did not detect a new source in the BAT error circle.  The 3-sigma\nlimiting magnitude based on USNO-B1.0 (I-band) stars is following.\n\nFilter   start time   end time    Exposure   Mag (3-sigma UL)  \n-----------------------------------------------------------\n Ic      09:46:58\u001b$B!!\u001b(B   10:08:08\u001b$B!!!!\u001b(B13 x 60s    17.8\n-----------------------------------------------------------",
  "circularId": 6794,
  "createdOn": 1190056251000,
  "email": "nkawai@hp.phys.titech.ac.jp",
  "subject": "GRB 070917: MITSuME Akeno Ic upper limit",
  "submitter": "Nobuyuki Kawai at Tokyo Tech  <nkawai@hp.phys.titech.ac.jp>",
  "eventId": "GRB 070917"
}