Baikal-GVD Astrophysical Neutrino Candidate near the Blazar TXS~0506+056
V. M. AynutdinovInstitute for Nuclear Research , Russian Academy of Sciences , Moscow , 117312 , RussiaV. A. AllakhverdyanJoint Institute for Nuclear Research , Dubna , 141980 , RussiaА. В. АвроринInstitute for Nuclear Research , Russian Academy of Sciences , Moscow , 117312 , RussiaZuzana BardačováИ. А. БелолаптиковJoint Institute for Nuclear Research , Dubna , 141980 , RussiaBondarev, E. A.Institute for Nuclear Research , Russian Academy of Sciences , Moscow , 117312 , RussiaI. V. BorinaJoint Institute for Nuclear Research , Dubna , 141980 , RussiaН. БудневIrkutsk State University , Irkutsk , 664003 , RussiaV. A. ChadymovA. S. ChepurnovSkobeltsyn Institute of Nuclear Physics , Moscow State University , Moscow , 119991 , RussiaV. Y. DikJoint Institute for Nuclear Research , Dubna , 141980 , RussiaGrigoryi Vladimirovich DomogatskyInstitute for Nuclear Research , Russian Academy of Sciences , Moscow , 117312 , RussiaArtyom A. DoroshenkoInstitute for Nuclear Research , Russian Academy of Sciences , Moscow , 117312 , RussiaR. DvornickýAleksei Nikolaevich DyachokIrkutsk State University , Irkutsk , 664003 , RussiaЖ.-А. М. ДжилкибаевE. EckerováT. V. ElzhovJoint Institute for Nuclear Research , Dubna , 141980 , RussiaL. FajtCzech Technical University in Prague , Institute of Experimental and Applied Physics , 11000 Prague , Czech RepublicВ. Н. ФоминА. Р. ГафаровIrkutsk State University , Irkutsk , 664003 , RussiaK. V. GolubkovInstitute for Nuclear Research , Russian Academy of Sciences , Moscow , 117312 , RussiaN.S. GorshkovJoint Institute for Nuclear Research , Dubna , 141980 , RussiaТ. И. ГрессIrkutsk State University , Irkutsk , 664003 , RussiaК. Г. КебкалIvan KharukInstitute for Nuclear Research , Russian Academy of Sciences , Moscow , 117312 , RussiaE. KhramovJoint Institute for Nuclear Research , Dubna , 141980 , RussiaMaksim Mikhailovich KolbinJoint Institute for Nuclear Research , Dubna , 141980 , RussiaS. O. KoligaevINFRAD , Dubna , 141981 , RussiaK. V. KonischevJoint Institute for Nuclear Research , Dubna , 141980 , RussiaAndey Vladimirovich KorobchenkoJoint Institute for Nuclear Research , Dubna , 141980 , RussiaА. П. КошечкинInstitute for Nuclear Research , Russian Academy of Sciences , Moscow , 117312 , RussiaВ. А. КожинSkobeltsyn Institute of Nuclear Physics , Moscow State University , Moscow , 119991 , RussiaМ. В. КругловJoint Institute for Nuclear Research , Dubna , 141980 , RussiaВ. Ф. КулеповNizhny Novgorod State Technical University , Nizhny Novgorod , 603950 , RussiaYu. E. LemeshevIrkutsk State University , Irkutsk , 664003 , RussiaM. Б. MиленинInstitute for Nuclear Research , Russian Academy of Sciences , Moscow , 117312 , RussiaR. R. MirgazovIrkutsk State University , Irkutsk , 664003 , RussiaD. NaumovJoint Institute for Nuclear Research , Dubna , 141980 , RussiaA. S. NikolaevSkobeltsyn Institute of Nuclear Physics , Moscow State University , Moscow , 119991 , RussiaD. P. PetukhovInstitute for Nuclear Research , Russian Academy of Sciences , Moscow , 117312 , RussiaEuvgenii Nikolaevich PliskovskyJoint Institute for Nuclear Research , Dubna , 141980 , RussiaМ. И. РозановSt. Petersburg State Marine Technical University , St. Petersburg , 190008 , RussiaE. V. RyabovIrkutsk State University , Irkutsk , 664003 , RussiaG. B. SafronovInstitute for Nuclear Research , Russian Academy of Sciences , Moscow , 117312 , RussiaD. SeitovaInstitute of Nuclear Physics of theBair Aleksandrovich ShaybonovJoint Institute for Nuclear Research , Dubna , 141980 , RussiaM.D. ShelepovInstitute for Nuclear Research , Russian Academy of Sciences , Moscow , 117312 , RussiaS. D. ShilkinInstitute for Nuclear Research , Russian Academy of Sciences , Moscow , 117312 , RussiaE. V. ShirokovSkobeltsyn Institute of Nuclear Physics , Moscow State University , Moscow , 119991 , RussiaF. ŠimkovicA. E. SirenkoJoint Institute for Nuclear Research , Dubna , 141980 , RussiaА. В. СкурихинSkobeltsyn Institute of Nuclear Physics , Moscow State University , Moscow , 119991 , RussiaA. G. SolovjevJoint Institute for Nuclear Research , Dubna , 141980 , RussiaМ. Н. СороковиковJoint Institute for Nuclear Research , Dubna , 141980 , RussiaI. ŠteklA. P. StromakovInstitute for Nuclear Research , Russian Academy of Sciences , Moscow , 117312 , RussiaO. V. SuvorovaInstitute for Nuclear Research , Russian Academy of Sciences , Moscow , 117312 , RussiaВ. А. ТаболенкоIrkutsk State University , Irkutsk , 664003 , RussiaB. B. UlzutuevJoint Institute for Nuclear Research , Dubna , 141980 , RussiaYu. V. YablokovaJoint Institute for Nuclear Research , Dubna , 141980 , RussiaD. ZaborovInstitute for Nuclear Research , Russian Academy of Sciences , Moscow , 117312 , RussiaS. I. Zav’yalovJoint Institute for Nuclear Research , Dubna , 141980 , RussiaD. Y. Zvezdov A. K. ErkenovN A KosogorovMoscow Institute of Physics and Technology , Institutsky per. 9 , Dolgoprudny 141700 , RussiaY. A. KovalevAstro Space CenterY. Y. KovalevAstro Space Center of Lebedev Physical Institute , Profsoyuznaya 84/32 , 117997 Moscow , RussiaA. V. PlavinAstro Space CenterA. V. PopkovAstro Space CenterA. B. PushkarevAstro Space Center of Lebedev Physical Institute , Profsoyuznaya 84/32 , 117997 Moscow , RussiaD. SemikozUniversité Paris DiderotY V SotnikovaMinistry of Energy of the Republic of Kazakhstan , 050032 , Almaty , KazakhstanS. TroitskyInstitute for Nuclear Research , Russian Academy of Sciences , Moscow , 117312 , Russia
2023en
ABI
Annotatsiya
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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