{
  "bibcode": "2010GCN.10679....1K",
  "body": "D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ),\nS. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto)\nand N. Kawai(Tokyo Tech)\nreport on behalf of the MITSuME collaboration:\n\n\nWe observed the field of GRB 100424A (Hoversten et al. GCNC 10667)\nwith the optical three color (g', Rc and Ic) CCD camera attached\nto the MITSuME 50cm telescope of Okayama Astrophysical Observatory.\nThe observation started on 2010-04-24 16:34:56 UT (~2.2 min after\nthe burst). We did not find any new point source within the XRT\nerror circle (Evans, GCNC 10668; Evans et al., GCNC 10669) in all\nthe three bands.\n\nThree sigma upper limits of the OT are listed below. We used SDSS\ncatalog for flux calibration.\n\n\nT0+[day]   MID-UT   T-EXP[sec]    g'     Rc     Ic\n------------------------------------------------------\n0.00527    16:40:18   540.0     >18.4  >18.5  >17.7\n0.04356    17:35:26  5940.0     >19.6  >20.0  >19.4\n------------------------------------------------------\nT0+ : Elapsed time after the burst [day]\nT-EXP: Total Exposure time [sec]",
  "circularId": 10679,
  "createdOn": 1272183240000,
  "email": "dikuroda@oao.nao.ac.jp",
  "subject": "GRB100424A: MITSuME optical upper limits",
  "submitter": "Daisuke Kuroda at OAO/NAOJ  <dikuroda@oao.nao.ac.jp>",
  "eventId": "GRB 100424A"
}