%0 Journal Article
%A Garrappa, S.
%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 realtime high-energy neutrino alerts
%J Astronomy and astrophysics
%V 687
%N arXiv:2401.06666
%@ 0004-6361
%C Les Ulis
%I EDP Sciences
%M PUBDB-2024-00292
%M arXiv:2401.06666
%P A59
%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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:001258192900014
%R 10.1051/0004-6361/202449221
%U https://bib-pubdb1.desy.de/record/601583