{
  "bibcode": "2020GCN.27813....1O",
  "body": "F. Ogawa, R. Hosokawa, R. Adachi, K. L. Murata, M. Niwano, N.\nNakamura, Y. Yatsu, and N. Kawai (TokyoTech) report on behalf of the\nMITSuME collaboration:\n\nWe observed the field of GRB 200524A (Fermi-LAT detection: Dirirsa et\nal., GCN #27797, Fermi-GBM detection: Pookalil et al., GCN #27809,\nSwift-XRT afterglow detection: Capalbi et al. GCN #27811, and others)\nwith the optical three color (g', Rc, and Ic) CCD cameras attached to\nthe MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan.\n\nThe observation started on 13:07:01.89 UT. We detected a point source\nclearly in g' and Rc band, and marginally in Ic band at the position\nconsistent with the afterglow reported previously (Ho et al., GCN\n#27799, Kumar et al., GCN #27800, Rumyantsev et al., GCN #27802,\nSanwal et al., GCN #27803, Perley et al., GCN #27805, Kumar et al.,\nGCN #27806, de Ugarte Postigo et al., GCN #27807, Blazek et al., GCN\n#27810). We measured the magnitudes as follows.\n\nT0+[hour] MID-UT T-EXP[sec] measured magnitudes\n------------------------------------------------------------------------------------------------\n8.03 13:10:54 420 g'=19.6+/-0.3, Rc=19.5+/-0.3, Ic=19.4+/-0.5\n------------------------------------------------------------------------------------------------\nT0+: Elapsed time after the burst\nT-EXP: Total Exposure time\n\nWe used GSC2.3 catalog for flux calibration. The magnitudes are\nexpressed in the Vega system. The images were processed in real-time\nthrough the MITSuME GPU reduction pipeline (Niwano et al. ,in prep;\nhttps://github.com/MNiwano/Eclair)",
  "circularId": 27813,
  "createdOn": 1590391087000,
  "email": "ogawa@hp.phys.titech.ac.jp",
  "subject": "GRB 200524A: MITSuME Akeno optical observation",
  "submitter": "Ogawa Futa at Tokyo Institute of Technology  <ogawa@hp.phys.titech.ac.jp>",
  "eventId": "GRB 200524A"
}