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IceCube has recently reported the discovery of high-energy neutrinos ofastrophysical origin, opening up the PeV (10^15 eV) sky. Because of their largepositional uncertainties, these events have not yet been associated to anyastrophysical source. We have found plausible astronomical counterparts in theGeV -- TeV bands by looking for sources in the available large area high-energygamma-ray catalogues within the error circles of the IceCube events. We thenbuilt the spectral energy distribution of these sources and compared it withthe energy and flux of the corresponding neutrino. Likely counterparts includemostly BL Lacs and two Galactic pulsar wind nebulae. On the one hand manyobjects, including the starburst galaxy NGC 253 and Centaurus A, despite beingspatially coincident with neutrino events, are too weak to be reconciled withthe neutrino flux. On the other hand, various GeV powerful objects cannot beassessed as possible counterparts due to their lack of TeV data. The definitiveassociation between high-energy astrophysical neutrinos and our candidates willbe significantly helped by new TeV observations but will be confirmed ordisproved only by further IceCube data. Either way, this will have momentousimplications for blazar jets, high-energy astrophysics, and cosmic-ray andneutrino astronomy.

Are both BL Lacs and pulsar wind nebulae the astrophysical counterparts of IceCube neutrino events?