{
  "bibcode": "2016GCN.19361....1T",
  "body": "I. Taboada (Georgia Tech) reports on behalf of the HAWC collaboration \n(http://www.hawc-observatory.org/collaboration/):\n\nOn April 27, 2016, the IceCube collaboration reported a track-like very \nhigh energy event that has a high probability of being an astrophysical \nneutrino (HESE Alert \n127853_67093193http://gcn.gsfc.nasa.gov/notices_amon/67093193_127853.amon). \nWith a declination of 9.34 deg (J2000), this event is in the field of \nview of HAWC.\n\nThe HAWC gamma-ray observatory is currently not operating due to a power \nfailure. However, we have searched for time integrated TeV scale \nemission using 341 days of data collected between November 2014 and \nDecember 2015.\n\nWithin the 0.6 degree 50% PSF containment region reported by IceCube, \nthe most significant point in the sky is RA = 240.38 and Dec = 9.86 \n(J2000), with a pre-trial significance of 1.2 standard deviations. There \nare approximately 20 trials in this search region.So, there is no \nevidence for a steady TeV source at this location.\n\nWe have calculated the necessary flux to perform a 5 sigma pre-trials \nobservation with 50% probability at the location reported by IceCube. \nAssuming a power law spectrum with index -2.3, this flux is:\n\ndN/dE = A (E/E_0)^-2.3 with A= 6.5x10^-13 /(TeV.cm^2.s) and  E_0 = 1 TeV.\n\nHAWC is a very-high-energy gamma-ray observatory operating in Central \nMexico at a latitude of 19 deg north. HAWC has an instantaneous field of \nview of 2 sr and surveys 2/3 of the sky every day. It is sensitive to \ngamma rays from 300 GeV to 100 TeV.\n\n\n-- \nIgnacio Taboada - Associate Professor\nCenter for Relativistic Astrophysics\nSchool of Physics - Georgia Institute of Technology\n837 State St. NW, Atlanta GA 30332-0430\nOffice +1(404)385-7679 | Fax +1(404)385-0830\nhttp://taboada.gatech.edu/",
  "circularId": 19361,
  "createdOn": 1461932644000,
  "email": "itaboada@gatech.edu",
  "subject": "Archival observations by HAWC of IceCube HESE event of April 27, 2016",
  "submitter": "Ignacio Taboada at Georgia Inst of Tech  <itaboada@gatech.edu>"
}