{
  "subject": "GRB 170317A: MITSuME Okayama Optical Observation",
  "eventId": "GRB 170317A",
  "bibcode": "2017GCN.20899....1K",
  "createdOn": 1489795870000,
  "circularId": 20899,
  "submitter": "Daisuke Kuroda at OAO/NAOJ  <dikuroda@oao.nao.ac.jp>",
  "email": "dikuroda@oao.nao.ac.jp",
  "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 and OISTER collaboration:\n\nWe observed the field of GRB 170317A (LaPorte et al., GCNC 20885)\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 2017-03-17 10:14:19 UT (~28 min after\nthe burst). We detected the previously reported afterglow (LaPorte\net al., GCNC 20885; Mazaeva et al., GCNC 20886) in Rc and Ic bands.\n\nThree sigma upper limit and photometric results of the OT are\nlisted below. We used GSC2.3 catalog for flux calibration.\n\n#T0+[day]  MID-UT    T-EXP[sec]   g'     Rc   Rc_err  Ic   Ic_err\n------------------------------------------------------------------\n0.06138    11:14:22    6120.0     >20.5  19.3 0.2     19.2 0.3\"\n------------------------------------------------------------------\nT0+ : Elapsed time after the burst [day]\nT-EXP: Total Exposure time [sec]"
}