{
  "bibcode": "2016GCN.19364....1B",
  "body": "Lindy Blackburn (CfA), Michael S. Briggs (UAH), Eric Burns (UAH), Jordan\nCamp\n(NASA/GSFC), Tito Dal Canton (NASA/GSFC), Nelson Christensen (Carleton\nCollege),\nValerie Connaughton (USRA), Adam Goldstein (NASA/MSFC), C. M. Hui\n(NASA/MSFC),\nPeter Jenke (UAH), Tyson Littenberg (UAH), Judith Racusin (NASA/GSFC),\nPeter\nShawhan (UMD), Leo Singer (NASA/GSFC), John Veitch (Birmingham), Colleen\nWilson-Hodge (NASA/MSFC), and Binbin Zhang (IAA-CSIC)\n\nWe have searched the Fermi Gamma-ray Burst Monitor data for a\ngamma-ray counterpart for the IceCube High Energy Starting Event (HESE)\n67093193, detected in run 127853 on 2016-04-27 05:52:32.00 UT (AMON GCN\nnotice rev. 2, http://gcn.gsfc.nasa.gov/notices_amon/67093193_127853.amon.\nSee http://gcn.gsfc.nasa.gov/doc/Public_Doc_AMON_IceCube_GCN_Alerts_v2.pdf\nfor a description of HESE events and related GCN notices).\n\nThe location of the neutrino was close to the Earth, but visible at event\ntime.\nThere were no on-board triggers in GBM near the time of the neutrino\ndetection.\nWe searched for associated gamma-ray emission with 3 different search\ntechniques.\n\nA seeded search for impulsive emission with durations between 0.256 s and\n8.192 s\naround the time and sky location of the detected neutrino yielded no\ncandidates\nabove the GBM background. The search method was developed to look for\nelectromagnetic counterparts in the GBM data of sub-threshold gravitational\nwave signals found in the LIGO data (Blackburn et al. 2015, ApJS, 217, 8),\nand implemented here searching from 30 s before to 90 s after and seeded\nwith the position of the detected neutrino.\n\nA blind search for untriggered impulsive emission in the GBM data\ncentered on the neutrino detection yielded no candidates consistent with the\nposition of the neutrino.  This search technique was developed for the\ndetection\nof untriggered short GRBs in the GBM data (Briggs et al., in prep.).\n\nMeasurements using the Earth Occultation technique (Wilson-Hodge et al.\n2012,\nApJS, 201, 33) using the IceCube position in 17.5 hours around the neutrino\ndetection place a three sigma flux limit of 224 mCrab between 12 and 300\nkeV.",
  "circularId": 19364,
  "createdOn": 1461964110000,
  "email": "eb0016@uah.edu",
  "subject": "IceCube-160427A: Fermi GBM Observations",
  "submitter": "Eric Burns at U of Alabama  <eb0016@uah.edu>",
  "eventId": "IceCube-160427A"
}