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A new era for multi-messenger astronomy has begun with the detection of the flaring gamma-ray blazar TXS 0506+056 in spatial and temporal coincidence with the high-energy neutrino IC-170922A. Since this outstanding result, several associations have been proposed between high-energy neutrinos and cosmic accelerators observed at different wavelengths. Thanks to the almost 15-years monitoring of the Fermi-Large Area Telescope (LAT), gamma-ray observations play a key role in the identification of candidate neutrino sources. These observations, provide crucial input to population studies, as well as realtime observations of exceptional transient events coincident with single high-energy neutrinos.
In this seminar, I will present an overview of the main results we have obtained in the identification of candidate blazar counterparts to high-energy neutrinos, focusing on the crucial contributions of Fermi-LAT observations to the multi-wavelength synergies in the astronomical community. I will also discuss future prospects and strategies in the multi-wavelength searches for counterparts to astrophysical neutrinos.