{
  "bibcode": "2010GCN.10774....1Y",
  "body": "Y.Yatsu, H. Nakajima, T. Enomoto, K. Kawakami,\nK. Tokoyoda, Shimokawabe, and N. Kawai (Tokyo Tech)\n report on behalf of the MITSuME collaboration:\n\nWe observed the field of GRB100513A (Baumgartner et al. GCNC 10746)\nwith the three color (g', Rc and Ic) CCD camera attached\nto the MITSuME 50 cm optical telescope at Akeno, Japan.\n\nThe observation started at 2010-05-13 11:07:42 UT.\nOn the combined images, we could not find the optical counterpart\n in the XRT error circle (GCN 10746) in the three bands.\nThe 3-sigma upper limits based on the GSC2.3 catalog are listed below:\n\nStart(UT) -- END(UT)  Total EXP[sec]    g'     Rc     Ic\n----------------------------------------------------------------\n11:07:42.1 -- 11:32:45.1   540.0      >18.9  >18.8  >18.3\n14:23:16.8 -- 14:50:38.0   960.0      >17.8  >18.0  >17.4\n14:50:46.5 -- 15:36:25.0  2220.0     > 19.1 > 19.0 > 18.4\n----------------------------------------------------------------",
  "circularId": 10774,
  "createdOn": 1274190613000,
  "email": "yatsu@hp.phys.titech.ac.jp",
  "subject": "GRB 100513A: MITSuME Akeno Optical Observation",
  "submitter": "Yoichi Yatsu at Tokyo Tech.  <yatsu@hp.phys.titech.ac.jp>",
  "eventId": "GRB 100513A"
}