{
  "bibcode": "2021GCN.29820....1S",
  "body": "Mahito Sasada, Ryo Imazawa, Tatsuya Nakaoka (Hiroshima U.); Masayuki\nYamanaka (Kyoto U.); Shigeo Kimura (Tohoku U.); Yousuke Utsumi\n(Stanford/SLAC)\n\n\nA GCN/AMON notice from IceCube collaboration  (\nhttps://gcn.gsfc.nasa.gov/gcn/notices_amon_icecube_cascade/135196_31863828.amon)\nreported an IceCube Cascade Event 210416a. We noticed that 3C 279 which was\na known QSO at a redshift of 0.54 resided in the center of the error region.\n\n\nKanata/HONIR has also observed 3C 279 for the past few days and identified\nthat 3C 279 exhibited a brightness decrease of ~0.5 mag in the R band from\nMJD=59315.651869 (2021/04/11) to MJD=59318.620938 (2021/04/14). We will\ncontinue the monitoring observation of 3C 279.\n\n\nKanata/HONIR is an optical and near-infrared simultaneous imager,\nspectrograph, and polarimeter equipped on the 150 cm Kanata telescope at\nHigashi-Hiroshima Observatory in Japan (Akitaya et al. 2014, Proc. SPIE\n9147, 91474O).",
  "circularId": 29820,
  "createdOn": 1618544453000,
  "email": "sasadam@hiroshima-u.ac.jp",
  "subject": "IceCubeCascade-210416a: Kanata Optical Imaging of 3C 279",
  "submitter": "Mahito Sasada at Hiroshima University  <sasadam@hiroshima-u.ac.jp>"
}