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000616868 088__ $$2arXiv$$aarXiv:2401.06666
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000616868 1001_ $$0P:(DE-HGF)0$$aGarrappa, Simone$$b0$$eCorresponding author
000616868 245__ $$aFermi-LAT follow-up observations in seven years of real-time high-energy neutrino alerts
000616868 260__ $$c2024
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000616868 500__ $$aA&A 687, A59 (2024). Published on A&A
000616868 520__ $$aThe realtime program for high-energy neutrino track events detected by the IceCube South Pole Neutrino Observatory releases alerts to the astronomical community with the goal of identifying electromagnetic counterparts to astrophysical neutrinos. Gamma-ray observations from the Fermi-Large Area Telescope (LAT) enabled the identification of the flaring gamma-ray blazar TXS 0506+056 as a likely counterpart to the neutrino event IC-170922A. By continuously monitoring the gamma-ray sky, Fermi-LAT plays a key role in the identification of candidate counterparts to realtime neutrino alerts. In this paper, we present the Fermi-LAT strategy for following up high-energy neutrino alerts applied to seven years of IceCube data. Right after receiving an alert, a search is performed in order to identify gamma-ray activity from known and newly detected sources that are positionally consistent with the neutrino localization. In this work, we study the population of blazars found in coincidence with high-energy neutrinos and compare them to the full population of gamma-ray blazars detected by Fermi-LAT. We also evaluate the relationship between the neutrino and gamma-ray luminosities, finding different trends between the two blazar classes BL Lacs and flat-spectrum radio quasars.Key words: astroparticle physics / neutrinos / galaxies: active / gamma rays: galaxies
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000616868 536__ $$0G:(GEPRIS)445052434$$aDFG project G:(GEPRIS)445052434 - SFB 1491: Das Wechselspiel der kosmischen Materie - von der Quelle bis zum Signal (445052434)$$c445052434$$x1
000616868 536__ $$0G:(EU-Grant)949555$$aMessMapp - Mapping Highly-Energetic Messengers throughout the Universe (949555)$$c949555$$fERC-2020-STG$$x2
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000616868 650_7 $$2INSPIRE$$aobservatory
000616868 650_7 $$2INSPIRE$$amonitoring
000616868 650_7 $$2INSPIRE$$alocalization
000616868 650_7 $$2INSPIRE$$aquasar
000616868 650_7 $$2INSPIRE$$atracks
000616868 650_7 $$2INSPIRE$$apole
000616868 650_7 $$2INSPIRE$$aelectromagnetic
000616868 693__ $$0EXP:(DE-H253)Fermi-20170101$$5EXP:(DE-H253)Fermi-20170101$$eThe Fermi Large Area Telescope$$x0
000616868 7001_ $$00000-0002-3308-324X$$aBuson, S.$$b1
000616868 7001_ $$0P:(DE-H253)PIP1096760$$aSinapius, J.$$b2$$udesy
000616868 7001_ $$0P:(DE-H253)PIP1006092$$aFranckowiak, A.$$b3
000616868 7001_ $$aLiodakis, I.$$b4
000616868 7001_ $$00000-0001-7233-9546$$aBartolini, C.$$b5
000616868 7001_ $$aGiroletti, M.$$b6
000616868 7001_ $$aNanci, C.$$b7
000616868 7001_ $$00000-0003-0406-7387$$aPrincipe, G.$$b8
000616868 7001_ $$aVenters, T. M.$$b9
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