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. 2018 Jul 13;361(6398):eaat1378.
doi: 10.1126/science.aat1378. Epub 2018 Jul 12.

Multimessenger Observations of a Flaring Blazar Coincident With High-Energy Neutrino IceCube-170922A


Multimessenger Observations of a Flaring Blazar Coincident With High-Energy Neutrino IceCube-170922A

IceCube Collaboration et al. Science. .


Previous detections of individual astrophysical sources of neutrinos are limited to the Sun and the supernova 1987A, whereas the origins of the diffuse flux of high-energy cosmic neutrinos remain unidentified. On 22 September 2017, we detected a high-energy neutrino, IceCube-170922A, with an energy of ~290 tera-electron volts. Its arrival direction was consistent with the location of a known γ-ray blazar, TXS 0506+056, observed to be in a flaring state. An extensive multiwavelength campaign followed, ranging from radio frequencies to γ-rays. These observations characterize the variability and energetics of the blazar and include the detection of TXS 0506+056 in very-high-energy γ-rays. This observation of a neutrino in spatial coincidence with a γ-ray-emitting blazar during an active phase suggests that blazars may be a source of high-energy neutrinos.

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