{
  "bibcode": "2020GCN.29008....1S",
  "body": "Sasada, M., Nakaoka, T., Akitaya, H. (Hiroshima U.),\nUtsumi, Y. (Stanford U./SLAC)\n\nWe report our optical and near-infrared imaging observations\nfor the IceCube high-energy neutrino candidate event,\nIceCube-201130A (GCN Circ. 28969).\n\nWe selected 11 radio sources from our BROS catalog\n(Itoh et al. 2020, ApJ 901, 3) including radio sources 3C 57, and\n4FGL J0206.4-1151 (ATel #14235) and imaged each of them\nin R and J bands with the Kanata telescope using the HONIR\nimaging and spectropolarimeter\n(Akitaya et al. 2014, Proc. SPIE 9147, 91474O). We present\nmagnitudes in the AB system. The upper limits are the 5-sigma\ndetection limits. Each magnitude is calibrated by nearby stars\nlisted in PanSTARRS for R, and in 2MASS catalogs for J.\n\nBROS_J0206.4-1150 was also observed by Swift (GCN Circ. 28994).\nThey reported mild decrease of source activity in X-rays and a\nmoderate brightening from U to M2 filter on December 2-3 with\nrespect to December 1. Our observations on 2020-12-01 10:14UT\nand 2020-12-02 09:40UT in the R band shown below were not able\nto confirm this brightness trend by large photometric error.\n\nBROS_J0201.9-1132 (3C 57) RA:30.488288, Dec:-11.542607\nMJD    R    J\n59184.41560, 15.89+/-0.04, 16.04+/-0.04\n59185.39238, 15.91+/-0.03, 16.09+/-0.04\n59186.41061, 15.93+/-0.04, 16.12+/-0.05\n59187.54670, 15.98+/-0.09, 16.19+/-0.06\n59191.44694, 15.92+/-0.04, 16.08+/-0.03\n\nBROS_J0206.4-1150 (4FGL J0206.4-1151) RA:31.608821, Dec:-11.844354\n59184.42646, 19.5+/-0.3, >18.7\n59185.40333, 19.8+/-0.3, >18.4\n59191.46875, 19.6+/-0.3, >19.2\n\nBROS_J0204.3-1157 RA:31.084787, Dec:-11.960983\n59184.43740, 18.4+/-0.2, 17.2+/-0.1\n59185.42506, 18.6+/-0.1, 17.3+/-0.1\n59186.42147, 18.46+/-0.08, 17.32+/-0.08\n59191.45787, 18.41+/-0.08, 17.37+/-0.09\n\nBROS_J0203.7-1250 RA:30.942665, Dec:-12.846279\n59184.45914, >19.8, >18.9\n\nBROS_J0200.7-1258 RA:30.193870, Dec:-12.967430\n59184.44823, >20.0, >19.0\n\nBROS_J0158.8-0932 RA:29.721666, Dec:-9.539370\n59184.48092, >19.7, >18.8\n\nBROS_J0150.5-1212 RA:27.637326, Dec:-12.214537\n59184.51353, >18.3, >18.3\n\nBROS_J0155.9-0945 RA:28.988929, Dec:-9.759423\n59184.47004, >20.3, >19.4\n59185.44682, >20.4, >19.0\n\nBROS_J0200.8-0936 RA:30.215875, Dec:-9.606755\n59184.49623, >18.5, >17.5\n\nBROS_J0202.0-1451 RA:30.523600, Dec:-14.863539\n59184.52442, 17.9+/-0.2, 17.0+/-0.1\n59191.47962, 17.8+/-0.1, 16.91+/-0.07\n\nBROS_J0202.8-0930 RA:30.713050, Dec:-9.514563\n59184.50265, >19.9, >19.0",
  "circularId": 29008,
  "createdOn": 1607499761000,
  "email": "sasadam@hiroshima-u.ac.jp",
  "subject": "IceCube-201130A: Optical and NIR Imaging Follow-up by Kanata Telescope",
  "submitter": "Mahito Sasada at Hiroshima University  <sasadam@hiroshima-u.ac.jp>",
  "eventId": "IceCube-201130A"
}