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The association of two IceCube detections, the IceCube-170922A event and aneutrino flare, with the blazar TXS0506+056, has paved the way for themultimessenger quest for cosmic accelerators. IceCube has observed many otherneutrinos but their origin remains unknown. To better understand the reason forthe apparent lack of neutrino counterparts we have extended the comprehensivedissection of the sky area performed for the IceCube-170922A event to all the70 public IceCube high-energy neutrinos that are well reconstructed and off theGalactic plane. Using the multi-frequency data available through the OpenUniverse platform, we have identified numerous candidate counterparts ofIceCube events. We report here the classification of all the gamma-ray blazarsfound and the results of subsequent statistical tests. In addition, we havechecked the 4LAC, 3FHL and 3HSP catalogues for potential counterparts.Following the dissection of all areas associated with IceCube neutrinos, weevaluate the data using a likelihood-ratio test and find a 3.23 sigma(post-trial) excess of HBLs and IBLs with a best-fit of 15 +/- 3.6 signalsources. This result, together with previous findings, consistently points to agrowing evidence for a connection between IceCube neutrinos and blazars, themost energetic particle accelerators known in the Universe.

Dissecting the regions around IceCube high-energy neutrinos: growing evidence for the blazar connection