IceCube catalog of alert events up through IceCube-170922A

Introduction A high-energy neutrino event alert was issued by IceCube on 22 September 2017 and was found coincident in direction and time with a gamma-ray flare from the blazar TXS 0506+056. As part of the analysis of this multi-messenger signal, all previous neutrinos that issued alerts within the realtime alert system (DOI:10.1016/j.astropartphys.2017.05.002), or would have […]

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IceCube data from 2008 to 2017 related to analysis of TXS 0506+056

Introduction A high-energy neutrino event detected by IceCube on 22 September 2017 was coincident in direction and time with a gamma-ray flare from the blazar TXS 0506+056. The analysis of this association was reported in Science (DOI:10.1126/science.aat1378). Prompted by this association, IceCube investigated 9.5 years of data recorded in the direction of this blazar to […]

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Measurement of atmospheric neutrino oscillations with three years of data from the full sky

Introduction In 2013, IceCube reported its first measurement of the neutrino oscillation parameters. This was the first time that neutrino oscillations were measured with precision at energies above 10 GeV. A year later, the collaboration presented a second analysis with three years of data that improved the precision by a factor of ten. The IceCube […]

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A combined maximum-likelihood analysis of the astrophysical neutrino flux

Introduction The IceCube Collaboration revisited six previous studies investigating the nature of the astrophysical neutrino flux in a combined maximum-likelihood analysis that used up to three observables—energy, zenith angle and event topology—to derive improved constraints on the energy spectrum and the composition of neutrino flavors (νe , νμ , ντ) of the astrophysical neutrino flux. […]

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Search for point sources with first year of IC86 data

Introduction IceCube performed a search for point-like sources of neutrinos using four years of IceCube data, including the first year of data from the completed 86-string detector, taken between May 2011 and May 2012. The search did not identify a single source, but the sensitivity was significantly improved from both the additional year of data […]

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Search for sterile neutrinos with one year of IceCube data

Introduction The IceCube neutrino telescope at the South Pole has measured the atmospheric muon neutrino spectrum as a function of zenith angle and energy to search for the oscillation signatures of light sterile neutrinos. No evidence for anomalous vμ or v –μ disappearance is observed in either of two independently developed analyses, each using one year of atmospheric neutrino data. […]

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The 79-string IceCube search for dark matter

Introduction Searches for high-energy neutrinos from the Sun are currently the most sensitive means of probing spin-dependent interactions between protons and most models for dark matter. In 2013, the IceCube Collaboration published the world’s best limits on the spin-dependent cross section for weakly interacting dark matter particles. Today, we present an improved event-level likelihood formalism […]

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Observation of Astrophysical Neutrinos in Four Years of IceCube Data

Introduction The spectrum of cosmic rays includes the most energetic particles ever observed. The mechanism of their acceleration and their sources are, however, still mostly unknown. Observing astrophysical neutrinos can help solve this problem. Because neutrinos are produced in hadronic interactions and are neither absorbed nor deflected, they will point directly back to their source. […]

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Astrophysical muon neutrino flux in the northern sky with 2 years of IceCube data

Introduction Results from the IceCube Neutrino Observatory have recently provided compelling evidence for the existence of a high energy astrophysical neutrino flux utilizing a dominantly Southern Hemisphere data set consisting primarily of νe and ντ charged-current and neutral-current (cascade) neutrino interactions. In the analysis presented here, a data sample of approximately 35000 muon neutrinos from […]

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IceCube-59: Search for point sources using muon events

Introduction A search for neutrino point sources using 3 years of IceCube data, including the 59-string configuration (May 2009 – May 2010), was performed. An all-sky scan was performed to look for spatial clustering of a fitting for the flux level and the spectral index. No significant hotspots were found. For more information on the […]

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