{
  "bibcode": "2013GCN.14166....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 130131A (Grupe et al., GCNC 14156)\nwith the optical three color (g', Rc and Ic) CCD camera attached\nto the MITSuME 50cm telescope of Okayama Astrophysical Observatory.\n\nThe observation started on 2013-01-31 14:53:53 UT (~58 min after the burst).\nWe did not find any new point source within the enhanced XRT circle\n(Evans et al., GCNC 14160) in all the three bands.\n\nThree sigma upper limits of the OT are listed below. We used\nSDSS catalog for flux calibration.\n\nT0+[day]   MID-UT   T-EXP[sec]    g'     Rc     Ic\n------------------------------------------------------\n0.10111    16:21:58    9000.0   >20.5  >20.5  >19.9\n------------------------------------------------------\nT0+ : Elapsed time after the burst [day]\nT-EXP: Total Exposure time [sec]",
  "circularId": 14166,
  "createdOn": 1359679807000,
  "email": "dikuroda@oao.nao.ac.jp",
  "subject": "GRB 130131A: MITSuME Okayama optical upper limits",
  "submitter": "Daisuke Kuroda at OAO/NAOJ  <dikuroda@oao.nao.ac.jp>",
  "eventId": "GRB 130131A"
}