{
  "bibcode": "2017GCN.20581....1M",
  "body": "Mori, H., Nakaoka, T., Kawabata, M., Hirochi, J., Kawahara, N.,\nYoshida, M., Kawabata, K. and Uemura, M. (Hiroshima Univ.) on\nbehalf of the OISTER collaboration\n\nWe performed R-band and Ks-band imaging observations around the\nerror circle of GRB 170202A (Racusin et al., GCN 20575) with the\noptical imager HOWPol and opt-NIR imager HONIR attached to Kanata\ntelescope of Hiroshima University. The observations took place at\n2017-02-02 18:33:37 UT (mid time of the observation). We detected\nthe optical transient reported by Xin et al.(GCN 20576), Lipunov\net al. (GCN 20578) and Guidorzi et al. (GCN 20579) in our R-band\nand Ks-band images. The detected magnitude of the OT and five\nsigma upper limit (in Vega magnitude) of the observations are\nlisted below.\n\n# T0+   MID-UT     T-EXP    R mag.   R err   R limit\n-----------------------------------------------------\n  335    18:33:37      30    16.35    0.3     18.0\n-----------------------------------------------------\n\n# T0+   MID-UT     T-EXP    Ks mag.  Ks err  Ks limit\n-----------------------------------------------------\n  3208   19:21:30    1320    17.1     0.4     18.6\n-----------------------------------------------------\nT0+ : Elapsed time after the burst [sec]\nT-EXP: Total Exposure time [sec]",
  "circularId": 20581,
  "createdOn": 1486077128000,
  "email": "yoshidam@hiroshima-u.ac.jp",
  "subject": "GRB 170202A: Kanata optical and infrared observations",
  "submitter": "Michitoshi Yoshida at HASC,Hiroshima U  <yoshidam@hiroshima-u.ac.jp>",
  "eventId": "GRB 170202A"
}