{
  "bibcode": "2019GCN.26019....1T",
  "body": "S. Toma, M. Niwano, R. Adachi, K. L. Murata,  M. Oeda, K.Shiraishi, K. Iida,\nF. Ogawa, R. Hosokawa, Y. Yatsu, and N. Kawai (TokyoTech)\nreport on behalf of the MITSuME collaboration:\n\n\nWe searched for the optical counterpart of GRB 191016A (J.D. Gropp et\nal., GCN Circular #26008) with the optical three color (g', Rc, and\nIc) CCD cameras\nattached to the MITSuME 50 cm telescope of Okayama\nAstrophysical Observatory, Okayama, Japan.\n\nThe observation started on 09:37:49.50 UT which corresponds to\n5.5 hours after the trigger.\nWe detected the point source at the position consistent with the\nafterglow detected previously (Alan M. Watson et al. GCN #26010).\nThe measured magnitudes and 3-sigma limit are listed as follows.\n\nT0+[sec]    MID-UT      T-EXP[sec]        g'       Rc        Ic\n���������������������������������������������������������������������������������������������������������������������������������������������������������\n20794      13:31:46          20040              19.5+/-0.4\n> 19.0     18.6+/-0.2\n-------------------------------------------------------------------------------------------------------\nT0+ : Elapsed time after the burst\nT-EXP: Total Exposure time\nWe used GSC2.3 and UCAC4 catalog for flux calibration.\nThe magnitudes are expressed in the Vega system.",
  "circularId": 26019,
  "createdOn": 1571310915000,
  "email": "toma@hp.phys.titech.ac.jp",
  "subject": "GRB191016A: MITSuME Okayama optical observation",
  "submitter": "Sayaka Toma at Tokyo Institute of Technology  <toma@hp.phys.titech.ac.jp>",
  "eventId": "GRB 191016A"
}