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@ARTICLE{Garrappa:601583,
      author       = {Garrappa, S. and Buson, S. and Sinapius, J. and
                      Franckowiak, A. and Liodakis, I. and Bartolini, C. and
                      Giroletti, M. and Nanci, C. and Principe, G. and Venters, T.
                      M.},
      title        = {${F}ermi$-{LAT} follow-up observations in seven years of
                      realtime high-energy neutrino alerts},
      journal      = {Astronomy and astrophysics},
      volume       = {687},
      issn         = {0004-6361},
      address      = {Les Ulis},
      publisher    = {EDP Sciences},
      reportid     = {PUBDB-2024-00292, arXiv:2401.06666},
      pages        = {A59},
      year         = {2024},
      note         = {$A\&A$ 687, A59 (2024). Published on $A\&A$},
      abstract     = {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.},
      cin          = {$Z_GA$},
      ddc          = {520},
      cid          = {$I:(DE-H253)Z_GA-20210408$},
      pnm          = {613 - Matter and Radiation from the Universe (POF4-613) /
                      DFG project G:(GEPRIS)445052434 - SFB 1491: Das Wechselspiel
                      der kosmischen Materie - von der Quelle bis zum Signal
                      (445052434) / MessMapp - Mapping Highly-Energetic Messengers
                      throughout the Universe (949555)},
      pid          = {G:(DE-HGF)POF4-613 / G:(GEPRIS)445052434 /
                      G:(EU-Grant)949555},
      experiment   = {EXP:(DE-H253)Fermi-20170101},
      typ          = {PUB:(DE-HGF)16},
      eprint       = {2401.06666},
      howpublished = {arXiv:2401.06666},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2401.06666;\%\%$},
      UT           = {WOS:001258192900014},
      doi          = {10.1051/0004-6361/202449221},
      url          = {https://bib-pubdb1.desy.de/record/601583},
}