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Baikal-GVD Astrophysical Neutrino Candidate near the Blazar TXS~0506+056

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arxiv 2308.13686 v1 pith:O5Q5CLN6 submitted 2023-08-25 astro-ph.HE

V.M. Aynutdinov , V.A. Allakhverdyan , A.D. Avrorin , A.V. Avrorin , Z. Bardačová , I.A. Belolaptikov , E.A. Bondarev , I.V. Borina
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N.M. Budnev V.A. Chadymov A.S. Chepurnov V.Y. Dik G.V. Domogatsky A.A. Doroshenko R. Dvornický A.N. Dyachok Zh.-A.M. Dzhilkibaev E. Eckerová T.V. Elzhov L. Fajt V.N. Fomin A.R. Gafarov K.V. Golubkov N.S. Gorshkov T. I. Gress K.G. Kebkal I.V. Kharuk E.V. Khramov M.M. Kolbin S.O. Koligaev K.V. Konischev A.V. Korobchenko A.P. Koshechkin V.A. Kozhin M.V. Kruglov V.F. Kulepov Y.E. Lemeshev M.B. Milenin R.R. Mirgazov D.V. Naumov A.S. Nikolaev D.P. Petukhov E.N. Pliskovsky M.I. Rozanov E.V. Ryabov G.B. Safronov D. Seitova B.A. Shaybonov M.D. Shelepov S.D. Shilkin E.V. Shirokov F. Šimkovic A.E. Sirenko A.V. Skurikhin A.G. Solovjev M.N. Sorokovikov I. Štekl A.P. Stromakov O.V. Suvorova V.A. Tabolenko B.B. Ulzutuev Y.V. Yablokova D.N. Zaborov S.I. Zavyalov D.Y. Zvezdov A.K. Erkenov N.A. Kosogorov Y.A. Kovalev Y.Y. Kovalev A.V. Plavin A.V. Popkov A.B. Pushkarev D.V. Semikoz Y.V. Sotnikova S.V. Troitsky
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classification astro-ph.HE
keywords baikal-gvdeventgvd210418caradioastrophysicalblazarcascadedirection
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abstract

We report on the observation of a rare neutrino event detected by Baikal-GVD in April 2021. The event GVD210418CA is the highest-energy cascade observed by Baikal-GVD so far from the direction below the horizon. The estimated cascade energy is $224\pm75$~TeV. The evaluated signalness parameter of GVD210418CA is 97.1\% using an assumption of the E$^{-2.46}$ spectrum of astrophysical neutrinos. The arrival direction of GVD210418CA is near the position of the well-known radio blazar TXS~0506+056, with the angular distance being within a 90\% directional uncertainty region of the Baikal-GVD measurement. The event was followed by a radio flare observed by the RATAN-600 radio telescope, further strengthening the case for the neutrino-blazar association.

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