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Prompt Searches for Very-high-energy γ -Ray Counterparts to IceCube Astrophysical Neutrino Alerts

(FACT Collaboration); (H.E.S.S. Collaboration); (MAGIC Collaboration); (VERITAS Collaboration); (Fermi-LAT Collaboration); (IceCube Collaboration); Abhir, J.; Biland, A.; Brand, K.; Bretz, T.; Dorner, D.; Eisenberger, L.; Elsaesser, D.; Günther, P.; Hasan, S.; Hildebrand, D.; Mannheim, K.; Linhoff, M.; Pfeifle, F.; ... mehr

Abstract:

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. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000191282
Veröffentlicht am 10.03.2026
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 01.02.2026
Sprache Englisch
Identifikator ISSN: 0004-637X, 1538-4357
KITopen-ID: 1000191282
Erschienen in The Astrophysical Journal
Verlag Institute of Physics Publishing Ltd (IOP Publishing Ltd)
Band 997
Heft 2
Seiten Art.-Nr.: 141
Vorab online veröffentlicht am 20.01.2026
Nachgewiesen in Web of Science
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