%0 Electronic Article
%A Garrappa, Simone
%A Buson, S.
%A Sinapius, J.
%A Franckowiak, A.
%A Liodakis, I.
%A Bartolini, C.
%A Giroletti, M.
%A Nanci, C.
%A Principe, G.
%A Venters, T. M.
%T Fermi-LAT follow-up observations in seven years of real-time high-energy neutrino alerts
%N arXiv:2401.06666
%M PUBDB-2024-06559
%M arXiv:2401.06666
%D 2024
%Z A&A 687, A59 (2024). Published on A&A
%X The 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
%K gamma ray (INSPIRE)
%K blazar (INSPIRE)
%K IceCube (INSPIRE)
%K observatory (INSPIRE)
%K monitoring (INSPIRE)
%K localization (INSPIRE)
%K quasar (INSPIRE)
%K tracks (INSPIRE)
%K pole (INSPIRE)
%K electromagnetic (INSPIRE)
%F PUB:(DE-HGF)25
%9 Preprint
%U https://bib-pubdb1.desy.de/record/616868