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

doi:10.3847/1538-4357/ae2c4e

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

ETH Zurich
University of Würzburg
GSI Helmholtzzentrum fur Schwerionenforschung
University of Dortmund
University of Geneva
Dublin Institute for Advanced Studies
Max-Planck-Institut für Kernphysik
Yerevan State University
Landessternwarte Heidelberg
University of Groningen
University of Namibia
North-West University
c/o DESY
University of Potsdam
Astroparticule and Cosmol APC
Linnaeus University, Växjö
Humboldt-Universität zu Berlin
Sorbonne Univ.
Sorbonne Université
University of Oxford
Université Paris-Saclay
Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen
Institute for Nuclear Physics
University of the Witwatersrand, Johannesburg
Ip Paris
University of Adelaide
Aix-Marseille Université
Western Sydney University
University of Tübingen
University of Innsbruck
Jagiellonian University
Nicolaus Copernicus University
The Barcelona Institute of Science and Technology
Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences
Laboratoire Univers et Particules de Montpellier
Univ. Bordeaux
Yerevan Physics Institute
University of Tokyo
Konan University
University of Amsterdam
University of Siena
University of Barcelona
Instituto de Astrofísica de Andalucía-CSIC
Istituto di Astrofisica e Planetologia Spaziali (IAPS)
and Physics University of Udine
ICRANet
Max-Planck-Institut für Physik
University of Padova
University of Zagreb, Faculty of Electrical Engineering and Computing
An OCC of Homi Bhabha National Institute
Centro Brasileiro de Pesquisas Fisicas
IPARCOS-UCM (Instituto de Física de Partículas y del Cosmos)
Research Unit; CIBERNED and Universidad de La Laguna
University of Lodz
INFN
Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT)
University of São Paulo
University of Pisa
Politecnico di Bari
University of Insubria
University of Bergen
Port d'Informació Científica (PIC)
University of Turin
University of Rijeka
Hiroshima University
ICRANet-Armenia
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split
Josip Juraj Strossmayer University of Osijek
University of Turku
Tokai University
University of Trieste
Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences
Università degli Studi di Catania
Yamagata University
University of Oulu
Chiba University
Nagoya University
Kyoto University
INFN Roma Tor Vergata
University of Southern Denmark
DePauw University
Temple University
University of Utah
Center for Astrophysics | Harvard & Smithsonian
Washington University in St. Louis
University of California, Los Angeles
California Polytechnic State University, San Luis Obispo
University of Minnesota
University of California at Santa Cruz
Dartmouth College
The Bartol Research Institute
University of Maryland
NASA Goddard Space Flight Center
University of Iowa
Ruhr-University Bochum
IDA Business Park
McGill University
Ball State University
Anderson University
Barnard College
University College Dublin
Cork Institute of Technology
University of Colorado at Denver
University of Alabama
Purdue University
Seoul National University
Indiana University Indianapolis
Biochemical and Environmental Engineering
Marquette University
Loyola University of Chicago
University of Canterbury
University of Wisconsin
Institute of Physics Bhubaneswar
Université Libre de Bruxelles
Niels Bohr Institutet
University of Kansas
Harvard University
Michigan State University
South Dakota School of Mines and Technology
Long Beach VA and University of California
Technical University of Munich
University of California, Berkeley
The Ohio State University
Chalmers University of Technology
RWTH Aachen University
Uppsala University
University of Rochester
Institute of Meteorology and Climate Research
Johannes Gutenberg University
College of Computing
Queen's University
The University of Adelaide
Drexel University
University of Nevada Las Vegas
Stony Brook University
Massachusetts Institute of Technology
Pennsylvania State University
Pennsylvania State University
Vrjie Universiteit Brussel
University of Louvain
University of Münster
University of Alberta
Bergische Universität Gesamthochschule Wuppertal
Southern University and AandM College
Academia Sinica, Institute Of Physics
Oskar Klein Centre
University of Wisconsin-Madison
Ernest Orlando Lawrence Berkeley National Laboratory
Simon Fraser University
Chung-Ang University
Columbia University
Yale University
Mercer University at Macon
University of Alaska Anchorage
Sungkyunkwan University
Ghent University
University of Wisconsin-River Falls
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna

Résultats de recherche: Contribution à un journal › Article › Revue par des pairs

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 followup 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.

langue originale	Anglais
Numéro d'article	141
journal	Astrophysical Journal
Volume	997
Numéro de publication	2
Les DOIs	https://doi.org/10.3847/1538-4357/ae2c4e
état	Publié - 1 févr. 2026

Accès au document

10.3847/1538-4357/ae2c4e

Autres fichiers et liens

Lien vers la publication dans Scopus

Contient cette citation

@article{0d33fa5088e94ce69e6699a44de92055,

title = "Prompt Searches for Very-high-energy γ-Ray Counterparts to IceCube Astrophysical Neutrino Alerts",

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 followup 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.",

author = "\{FACT Collaboration\} and \{H.E.S.S. Collaboration\} and \{MAGIC Collaboration\} and \{VERITAS collaboration\} and \{Fermi LAT Collaboration\} and \{Icecube Collaboration\} and J. Abhir and A. Biland and K. Brand and T. Bretz and D. Dorner and L. Eisenberger and D. Els{\"a}sser and P. G{\"u}nther and S. Hasan and D. Hildebrand and K. Mannheim and M. Linhoff and F. Pfeifle and W. Rhode and B. Schleicher and V. Sliusar and M. Vorbrugg and R. Walter and F. Aharonian and Benkhali, \{F. Ait\} and J. Aschersleben and H. Ashkar and M. Backes and Martins, \{V. Barbosa\} and R. Batzofin and Y. Becherini and D. Berge and M. B{\"o}ttcher and C. Boisson and J. Bolmont and J. Borowska and R. Brose and A. Brown and F. Brun and B. Bruno and S. Casanova and J. Celic and M. Cerruti and A. Chen and M. Chernyakova and J. Chibueze and O. Chibueze and B. Cornejo and G. Cotter and G. Cozzolongo and \{Damascene Mbarubucyeye\}, J. and \{de Assis Scarpin\}, J. and \{Delgado Giles\}, A. and A. Djannati-Ata{\"i} and J. Djuvsland",

note = "Publisher Copyright: {\textcopyright} 2026. The Author(s). Published by the American Astronomical Society.",

year = "2026",

month = feb,

day = "1",

doi = "10.3847/1538-4357/ae2c4e",

language = "English",

volume = "997",

journal = "Astrophysical Journal",

issn = "0004-637X",

number = "2",

}

TY - JOUR

T1 - Prompt Searches for Very-high-energy γ-Ray Counterparts to IceCube Astrophysical Neutrino Alerts

AU - FACT Collaboration

AU - H.E.S.S. Collaboration

AU - MAGIC Collaboration

AU - VERITAS collaboration

AU - Fermi LAT Collaboration

AU - Icecube Collaboration

AU - Abhir, J.

AU - Biland, A.

AU - Brand, K.

AU - Bretz, T.

AU - Dorner, D.

AU - Eisenberger, L.

AU - Elsässer, D.

AU - Günther, P.

AU - Hasan, S.

AU - Hildebrand, D.

AU - Mannheim, K.

AU - Linhoff, M.

AU - Pfeifle, F.

AU - Rhode, W.

AU - Schleicher, B.

AU - Sliusar, V.

AU - Vorbrugg, M.

AU - Walter, R.

AU - Aharonian, F.

AU - Benkhali, F. Ait

AU - Aschersleben, J.

AU - Ashkar, H.

AU - Backes, M.

AU - Martins, V. Barbosa

AU - Batzofin, R.

AU - Becherini, Y.

AU - Berge, D.

AU - Böttcher, M.

AU - Boisson, C.

AU - Bolmont, J.

AU - Borowska, J.

AU - Brose, R.

AU - Brown, A.

AU - Brun, F.

AU - Bruno, B.

AU - Casanova, S.

AU - Celic, J.

AU - Cerruti, M.

AU - Chen, A.

AU - Chernyakova, M.

AU - Chibueze, J.

AU - Chibueze, O.

AU - Cornejo, B.

AU - Cotter, G.

AU - Cozzolongo, G.

AU - Damascene Mbarubucyeye, J.

AU - de Assis Scarpin, J.

AU - Delgado Giles, A.

AU - Djannati-Ataï, A.

AU - Djuvsland, J.

PY - 2026/2/1

Y1 - 2026/2/1

N2 - 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 followup 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.

AB - 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 followup 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.

UR - https://www.scopus.com/pages/publications/105036063624

U2 - 10.3847/1538-4357/ae2c4e

DO - 10.3847/1538-4357/ae2c4e

M3 - Article

AN - SCOPUS:105036063624

SN - 0004-637X

VL - 997

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 141

ER -

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

Résumé

Accès au document

Autres fichiers et liens

Empreinte digitale

Contient cette citation