{
  "bibcode": "2011GCN.12787....1I",
  "body": "R. Itoh, K. Takaki, M. Yamanaka, M. Sasada, K. Sakimoto, M. Yoshida,\nK. S. Kawabata, Y. Hanabata, M. Ohno, Y. Fukazawa (HiroshimaUniv.),\nA. Nakashima (Tokyo Univ.) report on behalf of the Kanata collaboration:\n\nWe performed optical and near infrared observations of GRB 111228A\n(Ukwatta et al., GCN 12737; Xin et al., GCN 12738) with the 1.5 m Kanata\nTelescope of Higashi-Hiroshima observatory, Japan. The observation\nstarted at 15:47 UT on 2011 December 28. We took a sequence of images\nin Rc and K bands, and detected the optical-infrared afterglow of the\nGRB (Veli-Pekka Hentunen et al. GCN 12754; Kuroda et al. GCN 12743;\nNicuesa Guelbenzu et al. GCN 12757; Usui et al. GCN 12768).\n\nPhotometric results are listed below. We used USNO-B1 catalog for flux\ncalibration of Rc band, and 2-MASS catalog for Ks band.\n\nMid time from  Total Exp   Filter    Magnitude\ntrigger (hr)    (s)\n-------------------------------------------------\n0.34            180x5        Ks    14.94 \u001b$B!^\u001b(B 0.10\n1.12            300x10       Rc    17.67 \u001b$B!^\u001b(B 0.04\n3.75            300x9        Rc    18.53 \u001b$B!^\u001b(B 0.02\n-------------------------------------------------",
  "circularId": 12787,
  "createdOn": 1325293486000,
  "email": "yoshidam@hiroshima-u.ac.jp",
  "subject": "GRB 111228A: Optical and NIR observations with Kanata telescope",
  "submitter": "Michitoshi Yoshida at HASC,Hiroshima U  <yoshidam@hiroshima-u.ac.jp>",
  "eventId": "GRB 111228A"
}