In the quest for high-energy neutrino sources, the Astrophysical Multimessenger Observatory Network has implemented a new search by combining data from the High Altitude Water Cherenkov (HAWC) Observatory and the Astronomy with a Neutrino Telescope and Abyss environmental RESearch (ANTARES) neutrino telescope. Using the same analysis strategy as in a previous detector combination of HAWC and IceCube data, we perform a search for coincidences in HAWC and ANTARES events that are below the threshold for sending public alerts in each individual detector. Data were collected between 2015 July and 2020 February with a live time of 4.39 yr. Over this time period, three coincident events with an estimated false-alarm rate of <1 coincidence per year were found. This number is consistent with background expectations.The National Science Foundation under grants PHY-1708146PHY-1806854The Institute for Gravitation and the
Cosmos of the Pennsylvania State UniversityCentre National de la Recherche
Scientifique (CNRS)Commissariat à l’énergie atomique et aux
énergies alternatives (CEA)Commission Européenne (FEDER
fund and Marie Curie Program)Institut Universitaire de
France (IUF), LabEx UnivEarthS (ANR-10-LABX-0023 and
ANR-18-IDEX-0001)Région Île-de-France (DIM-ACAV),
Région Alsace (contrat CPER)Région Provence-Alpes-Côte
d’Azur, Département du Var and Ville de La Seyne-sur-MerBundesministerium für Bildung und Forschung
(BMBF)Istituto Nazionale di Fisica Nucleare
(INFN)Nederlandse organisatie voor Wetenschappelijk
Onderzoek (NWO)Executive Unit for
Financing Higher Education, ResearchDevelopment and
Innovation (UEFISCDI)Romania; Ministerio de Ciencia,
Innovación, Investigación y Universidades (MCIU)Programa
Estatal de Generación de Conocimiento (refs. PGC2018-
096663-B-C41, -A-C42-B-C43-B-C44PID2021-
124591NB-C41-C42-C43(MCIU/FEDER)Generalitat
ValencianaPrometeo (PROMETEO/2020/019)Grisolía
(refs. GRISOLIA/2018/119, /2021/192)GenT (refs.
/2019/043, /2020/049, /2021/023) programs, Junta de
Andalucía (ref. A-FQM-053-UGR18)La Caixa Foundation
(ref. LCF/BQ/IN17/11620019)MSC program (ref.
101025085)Spain; Ministry of Higher Education, Scientific
Research and InnovationThe Arab Fund for
Economic and Social Development, KuwaitUS National
Science Foundation (NSF)The US Department of Energy
Office of High-Energy PhysicsLaboratory Directed
Research and Development (LDRD) program of Los Alamos
National LaboratoryConsejo Nacional de Ciencia y Tecnología
(CONACyT)México, grants 271051, 232656, 260378179588254964258865243290132197A1-S-46288A1-
S-22784Cátedras 873, 1563, 341, 323Red HAWC, MéxicoDGAPA-UNAM grants IG101320IN111716-3, IN111419IA102019IN110621IN110521VIEP-BUAPPIFI 2012PROFOCIE 2014, 2015the University of Wisconsin
Alumni Research FoundationThe Institute of Geophysics,
Planetary PhysicsSignatures at Los Alamos National LaboratoryPolish Science Centre grantDEC-2017/27/B/
ST9/02272Coordinación de la Investigación Científica de la
Universidad Michoacana; Royal Society—Newton Advanced
Fellowship 180385Generalitat Valenciana, grant CIDEGENT/
2018/034The Program Management Unit for Human
Resources & Institutional Development, Research and Innovation,
NXPO (grant No. B16F630069)Coordinación General
Académica e Innovación (CGAI-UdeG)PRODEP-SEP UDGCA-
499; Institute of Cosmic Ray Research (ICRR),University
of TokyoNASA under award
number 80GSFC21M000
