TY  - JOUR
AU  - Garrappa, S.
AU  - Buson, S.
AU  - Sinapius, J.
AU  - Franckowiak, A.
AU  - Liodakis, I.
AU  - Bartolini, C.
AU  - Giroletti, M.
AU  - Nanci, C.
AU  - Principe, G.
AU  - Venters, T. M.
TI  - Fermi-LAT follow-up observations in seven years of realtime high-energy neutrino alerts
JO  - Astronomy and astrophysics
VL  - 687
IS  - arXiv:2401.06666
SN  - 0004-6361
CY  - Les Ulis
PB  - EDP Sciences
M1  - PUBDB-2024-00292
M1  - arXiv:2401.06666
SP  - A59
PY  - 2024
N1  - A&A 687, A59 (2024). Published on A&A
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001258192900014
DO  - DOI:10.1051/0004-6361/202449221
UR  - https://bib-pubdb1.desy.de/record/601583
ER  -