{
  "bibcode": "2020GCN.26709....1A",
  "body": "Hugo Ayala (PSU) reports on behalf of the HAWC\ncollaboration (http://www.hawc-observatory.org/collaboration):On\n2020/01/09 23:41:39 UTC, the IceCube collaboration reported a\ntrack-like very-high-energy event  that has a high probability of\nbeing an astrophysical neutrino, IceCube-200109A. Location is at\nRA: 164.49 (+4.94/-41.9  90% PSF containment) J2000\nDec: 11.87 (+1.16/-1.36 deg 90% PSF containment) J2000\nhttps://gcn.gsfc.nasa.gov/gcn3/26696.gcn3\n(GCN circular 26696).\n\n\nWe performed two types of analyses for the follow-up. The first is for\na steady source in archival data and the second is a search for a\ntransient source. We assume a power-law spectrum with an index of -2.3\nfor both analyses.\n\n\nSearch for a steady source in archival data:\nThe archival data spans from November 2014 to November 2019.\nWe searched inside the IceCube error region from the circular.\nThe highest significance, 2.77 sigma (0.89 post-trials),\nis at RA 167.39 deg, Dec 11.03 deg (+-1.78 deg 68% containment) J2000.\nWe set a time-integrated 95% CL  upper limit on gamma rays at the\nmaximum position of:\nE^2 dN/dE = 3.02e-13 (E/TeV)^-0.3 TeV cm^-2 s^-1\n\n\nSearch for a transient source.\nSince the IceCube event fall inside the HAWC field of view,\nwe report on the result for the current transit of the IceCube\nposition.Data acquisition started on Data Start: 2020/01/08 13:01:36\nUTC and ended\n2020/01/10 13:29:43 UTC.\nThe most significant location, with 2.40 sigma (-1.76 post-trials),\nis at RA 164.0 deg, Dec 11.15 deg (+-1.8 deg 68% containment) J2000.\nWe set a time-integrated 95% CL upper limit at the position of\nmaximum significance of:\nE^2 dN/dE = 1.12e-11 (E/1TeV)^-0.3 TeV cm^-2 s^-1\n\nHAWC is a very-high-energy gamma-ray observatory operating in Central\nMexico at latitude 19 deg. north. Operating day and night with over\n95% duty cycle, HAWC has an instantaneous field of view of 2 sr and\nsurveys 2/3 of the sky every day. It is sensitive to gamma rays from\n300 GeV to 100 TeV.",
  "circularId": 26709,
  "createdOn": 1578765233000,
  "email": "hgayala@psu.edu",
  "subject": "IceCube 200109A: No significant detection in HAWC",
  "submitter": "Hugo Ayala at Pennsylvania State University  <hgayala@psu.edu>",
  "eventId": "IceCube-200109A"
}