{
  "subject": "LIGO/Virgo G274296: IceCube neutrino observations",
  "eventId": "LIGO/Virgo G274296",
  "bibcode": "2017GCN.20709....1B",
  "createdOn": 1487627188000,
  "circularId": 20709,
  "submitter": "Imre Bartos at Columbia/LIGO  <imrebartos@gmail.com>",
  "email": "imrebartos@gmail.com",
  "body": "I. Bartos, S. Countryman (Columbia), C. Finley (U Stockholm), E. Blaufuss (U Maryland), R. Corley, Z. Marka, S. Marka (Columbia) on behalf of the IceCube Collaboration\n\nWe searched IceCube online track-like neutrino candidates (GFU) detected in a [-500,500] second interval about the LIGO-Virgo trigger G274296.  We compared the candidate source directions of 3 temporally-coincident neutrinos to the cWB skymap, with the following parameters:\n\n#  dt[s] RA[deg] Dec[deg] E[TeV]  Sigma[deg]\n--------------------------------------------\n1. -279  136.6   20.8      9.55   1.7\n2. -134  299.3   14.3     10.53   0.6\n3.  228    9.8    7.7      5.36   0.4\n\nThe analysis found NO COINCIDENT ONLINE TRACK-LIKE NEUTRINO CANDIDATES detected by IceCube within the 500 second window surrounding G274296 within the cWB skymap.\n\nIn addition, we performed coincident searches with other IceCube data streams, including the high-energy starting events (HESE) and Supernova triggers.  HESE events have typical energies > 60 TeV and start inside the detector volume, leading to a relatively pure event sample with a high fraction of astrophysical neutrinos.  The SN trigger system is sensitive to sudden increases in photomultiplier counts across the detector, which could indicate a burst of MeV neutrinos.   NO COINCIDENT HESE OR SUPERNOVA SIGNATURES were identified by these searches.\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica.  For a description of the IceCube realtime alert system, please refer to<http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1610.01814>; for more information on joint neutrino and gravitational wave searches, please refer to<http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1602.05411>."
}