{
  "bibcode": "2017GCN.21801....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 MITSuME and OISTER collaboration:\n\nWe observed the field of GRB 170903A (Markwardt et al., GCNC 21793)\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 2017-09-03 12:49:43 UT (~35 sec after\nthe burst). We did not find any new point source within the\nenhanced XRT error circle (Goad et al., GCNC 21797) in all\nthe three bands.\n\nThree sigma upper limits of the OT are listed below.\nWe used SDSS-DR8 catalog for flux calibration.\n\n#T0+[day]  MID-UT    T-EXP[sec]   g'    Rc     Ic\n-----------------------------------------------------\n0.03712    13:42:34    5280.0   >19.4  >19.5  >18.7\n-----------------------------------------------------\nT0+ : Elapsed time after the burst [day]\nT-EXP: Total Exposure time [sec]",
  "circularId": 21801,
  "createdOn": 1504484361000,
  "email": "dikuroda@oao.nao.ac.jp",
  "subject": "GRB 170903A: MITSuME Okayama upper limits",
  "submitter": "Daisuke Kuroda at OAO/NAOJ  <dikuroda@oao.nao.ac.jp>",
  "eventId": "GRB 170903A"
}