Prompt searches for very-high-energy γ-ray counterparts to IceCube astrophysical neutrino alerts
The search for sources of high-energy astrophysical neutrinos can be significantly advanced through a multimessenger approach, which seeks to detect the γ-rays that accompany neutrinos as they are produced at their sources. Multimessenger observations have so far provided the first evidence for a ne...
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Article (Journal) |
| Langue: | anglais |
| Publié: |
2026 February 1
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| In: |
The astrophysical journal
Year: 2026, Volume: 997, Numéro: 2, Pages: 1-37 |
| ISSN: | 1538-4357 |
| DOI: | 10.3847/1538-4357/ae2c4e |
| Accès en ligne: | Verlag, kostenfrei, Volltext: https://doi.org/10.3847/1538-4357/ae2c4e
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| Notes sur l'auteur: | FACT Collaboration, H.E.S.S. Collaboration*, MAGIC Collaboration, VERITAS Collaboration, Fermi-LAT Collaboration, IceCube Collaboration |
| Résumé: | The search for sources of high-energy astrophysical neutrinos can be significantly advanced through a multimessenger approach, which seeks to detect the γ-rays that accompany neutrinos as they are produced at their sources. Multimessenger observations have so far provided the first evidence for a neutrino source, illustrated by the joint detection of the flaring blazar TXS 0506+056 in high-energy (E > 1 GeV) and very-high-energy (VHE; E > 100 GeV) γ-rays in coincidence with the high-energy neutrino IceCube-170922A, identified by IceCube. Imaging atmospheric Cherenkov telescopes (IACTs), namely FACT, H.E.S.S., MAGIC, and VERITAS, continue to conduct extensive neutrino target-of-opportunity follow-up programs. These programs have two components: follow-up observations of single astrophysical neutrino candidate events (such as IceCube-170922A), and observation of known γ-ray sources after the identification of a cluster of neutrino events by IceCube. Here we present a comprehensive analysis of follow-up observations of high-energy neutrino events observed by the four IACTs between 2017 September (after the IceCube-170922A event) and 2021 January. Our study found no associations between γ-ray sources and the observed neutrino events. We provide a detailed overview of each neutrino event and its potential counterparts. Furthermore, a joint analysis of all IACT data is included, yielding combined upper limits on the VHE γ-ray flux. |
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| Description: | Veröffentlicht: 20. Januar 2026 *H.E.S.S. Collaboration: F. Aharonian, C. Escañuela Nieves, J. Hinton, F. Jankowsky, R. Marx, A. Quirrenbach, H. Ren, F. Rieger, S.J. Wagner, M. Zacharias [und 824 weitere Personen] Gesehen am 22.04.2026 |
| Description matérielle: | Online Resource |
| ISSN: | 1538-4357 |
| DOI: | 10.3847/1538-4357/ae2c4e |