{
  "bibcode": "2010GCN.10997....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\nWe observed the field of GRB 100725B (Baumgartner et al. GCNC 10983)\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 2010-07-25 14:05:46 UT (~2.7 h after\nthe burst). We did not find any new point source within the XRT\nerror circle (Goad et al., GCNC 10986) in all the 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------------------------------------------------------\n0.13892    14:44:37  7620.0     >19.7  >19.3  >18.7\n------------------------------------------------------\nT0+ : Elapsed time after the burst [day]\nT-EXP: Total Exposure time [sec]",
  "circularId": 10997,
  "createdOn": 1280190497000,
  "email": "dikuroda@oao.nao.ac.jp",
  "subject": "GRB100725B: MITSuME optical upper limits",
  "submitter": "Daisuke Kuroda at OAO/NAOJ  <dikuroda@oao.nao.ac.jp>",
  "eventId": "GRB 100725B"
}