{
  "bibcode": "2010GCN.11190....1Y",
  "body": "M. Yoshida, M. Sasada, T. Komatsu and K. S. Kawabata (HASC, Hiroshima\nUniversity)\n\nWe performed R band imaging observation of the optical afterglow of\nGRB 100901A (Immler et al., GCN 11159) with the 1.5m Kanata telescope\nof Hiroshima University.\n\nThe observation was made from 2010-09-02 15:07:24 UT (~1.06 day after\nthe burst) to 15:50:33 UT.  The previously reported afterglow (e.g\nImmler et al. GCN 11159; Kuroda et al. GCN 11172; or Kann et al.\nGCN 11187) was clearly detected. The afterglow showed a marginal\nincreasing trend in brightness within this observation.\n\nPhotometric results of the afterglow are listed below. We used USNO-\nB1.0 1127-0027231 (R = 15.37) for flux calibration.\n\n#T0+[day]  MID-UT    T-EXP[sec]     Rc    err\n-----------------------------------------------\n1.070266   15:15:21   900.0       18.62   0.10\n1.081620   15:31:42   900.0       18.60   0.07\n1.096759   15:53:30   900.0       18.54   0.04\n-----------------------------------------------\nT0+ : Elapsed time after the burst [day]\nT-EXP: Total Exposure time [sec]",
  "circularId": 11190,
  "createdOn": 1283493838000,
  "email": "yoshida@oao.nao.ac.jp",
  "subject": "GRB 100901A: Kanata Telescope observation of the optical afterglow",
  "submitter": "Michitoshi Yoshida at Okayama Astrophysical Obs  <yoshida@oao.nao.ac.jp>",
  "eventId": "GRB 100901A"
}