{
  "bibcode": "2010GCN.11189....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 100901A (Immler et al., GCN 11159)\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 2010-09-2 16:51:50 UT (~1.14 day after\nthe burst).  We detected the previously reported afterglow\n(Immler et al., GCN 11159; Guidorzi et al., GCN 11160; Klunko et al.,\nGCN 11162; Ivanov et al., GCN 11165; Andreev et al., GCN 11166,\nGCN 11168; De Cia et al., GCN 11170; Kuroda et al., GCN 11172) in\nall the three bands.\n\nPhotometric results of the OT are listed below.\nThe magnitudes are obtained from the sum of exposures. No significant\nvariation was detected during these exposures, though the S/N was not\nso good. We used SDSS catalog for flux calibration.\n\n#T0+[day]  MID-UT    T-EXP[sec]   g'  g'_err   Rc  Rc_err   Ic  Ic_err\n----------------------------------------------------------------------\n1.17902    17:51:57  6060.0      19.4  0.1    19.0  0.1    18.5  0.1\n----------------------------------------------------------------------\nT0+ : Elapsed time after the burst [day]\nT-EXP: Total Exposure time [sec]",
  "circularId": 11189,
  "createdOn": 1283492888000,
  "email": "dikuroda@oao.nao.ac.jp",
  "subject": "GRB100901A: MITSuME  Okayama Optical Observation at 1 day after the burst",
  "submitter": "Daisuke Kuroda at OAO/NAOJ  <dikuroda@oao.nao.ac.jp>",
  "eventId": "GRB 100901A"
}