Journal Article PUBDB-2024-00292

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$Fermi$-LAT follow-up observations in seven years of realtime high-energy neutrino alerts

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2024
EDP Sciences Les Ulis

Astronomy and astrophysics 687, A59 () [10.1051/0004-6361/202449221]
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Report No.: arXiv:2401.06666

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.

Classification:

Note: A&A 687, A59 (2024). Published on A&A

Contributing Institute(s):
  1. Gammaastronomie (Z_GA)
Research Program(s):
  1. 613 - Matter and Radiation from the Universe (POF4-613) (POF4-613)
  2. DFG project G:(GEPRIS)445052434 - SFB 1491: Das Wechselspiel der kosmischen Materie - von der Quelle bis zum Signal (445052434) (445052434)
  3. MessMapp - Mapping Highly-Energetic Messengers throughout the Universe (949555) (949555)
Experiment(s):
  1. The Fermi Large Area Telescope

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Fermi-LAT follow-up observations in seven years of real-time high-energy neutrino alerts
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 Record created 2024-01-17, last modified 2025-07-15