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$Investigating IceCube Neutrino Alerts with the HAWC \$\$-Ray Observatory$

Investigating IceCube Neutrino Alerts with the HAWC \$\$-Ray Observatory

by Kieda, D , Nellen, L , Andrés, A , Capistrán, T , A Gonzalez Muñoz , Watson, I J , S Yu , Nayerhoda, A , González, M M , Hinton, J , Caballero-Mora, K S , Leavitt, K , Anita-Rangel, E , Alvarez, C , The HAWC Collaboration , Casanova, S , Nisa, M U , Mostafá, M , Araya, M , De la Fuente, E , Schneider, M , Rosa-González, D , García-González, J A , Hüntemeyer, P , Son, Y , Garfias, F , Salazar-Gallegos, D , Arteaga-Velázquez, J C , González, J A , Torres, I , Fraija, N , Matthews, J A , Hueyotl-Zahuantitla, F , Desiati, P , Babu, R , Fraija, S , Wang, X , Alfaro, R , Wang, Z , Torres-Escobedo, R , Tibolla, O , Ponce, E , Herzog, I , Engel, K , Varela, E , Iriarte, A , Najafi, M , S Coutiño de León , Ayala Solares, H A , D Avila Rojas , Cotzomi, J , Kaufmann, S , Lee, J , Roth, M , Villaseñor, L , Sandoval, A , Zhou, H , Smith, A J , Longinotti, A L , Gyeong, J , Osorio-Archila, M , N Di Lalla , Shin, M , Espinoza, C , Tollefson, K , Martínez-Castro, J , Miranda-Romagnoli, P , Guevel, D , H León Vargas , Springer, R W , Belmont-Moreno, E , Martinez, O , Moreno, E , Díaz-Vélez, J C , Malone, K , Carreón, F , Pérez-Pérez, E G , Lee, W H , Salazar, H , Serna-Franco, J , Mirón-Enriquez, P E , DuVernois, M A , de León, C , Hernández-Cade

in Active galactic nuclei / Cosmic rays / Gamma rays / High altitude / Neutrinos / Observatories

2026

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Investigating IceCube Neutrino Alerts with the HAWC \$\$-Ray Observatory

in Active galactic nuclei / Cosmic rays / Gamma rays / High altitude / Neutrinos / Observatories

2026

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$Investigating IceCube Neutrino Alerts with the HAWC \$\$-Ray Observatory$

Investigating IceCube Neutrino Alerts with the HAWC \$\$-Ray Observatory

in Active galactic nuclei / Cosmic rays / Gamma rays / High altitude / Neutrinos / Observatories

2026

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$Investigating IceCube Neutrino Alerts with the HAWC \$\$-Ray Observatory$

Paper

Investigating IceCube Neutrino Alerts with the HAWC \$\$-Ray Observatory

Kieda, D,

Nellen, L,

Andrés, A,

Capistrán, T,

A Gonzalez Muñoz,

Watson, I J,

S Yu,

Nayerhoda, A,

González, M M,

Hinton, J,

Caballero-Mora, K S,

Leavitt, K,

Anita-Rangel, E,

Alvarez, C,

The HAWC Collaboration,

Casanova, S,

Nisa, M U,

Mostafá, M,

Araya, M,

De la Fuente, E,

Schneider, M,

Rosa-González, D,

García-González, J A,

Hüntemeyer, P,

Son, Y,

Garfias, F,

Salazar-Gallegos, D,

Arteaga-Velázquez, J C,

González, J A,

Torres, I,

Fraija, N,

Matthews, J A,

Hueyotl-Zahuantitla, F,

Desiati, P,

Babu, R,

Fraija, S,

Wang, X,

Alfaro, R,

Wang, Z,

Torres-Escobedo, R,

Tibolla, O,

Ponce, E,

Herzog, I,

Engel, K,

Varela, E,

Iriarte, A,

Najafi, M,

S Coutiño de León,

Ayala Solares, H A,

D Avila Rojas,

Cotzomi, J,

Kaufmann, S,

Lee, J,

Roth, M,

Villaseñor, L,

Sandoval, A,

Zhou, H,

Smith, A J,

Longinotti, A L,

Gyeong, J,

Osorio-Archila, M,

N Di Lalla,

Shin, M,

Espinoza, C,

Tollefson, K,

Martínez-Castro, J,

Miranda-Romagnoli, P,

Guevel, D,

H León Vargas,

Springer, R W,

Belmont-Moreno, E,

Martinez, O,

Moreno, E,

Díaz-Vélez, J C,

Malone, K,

Carreón, F,

Pérez-Pérez, E G,

Lee, W H,

Salazar, H,

Serna-Franco, J,

Mirón-Enriquez, P E,

DuVernois, M A,

de León, C,

Hernández-Cade

2026

Overview

Neutrino emission from astrophysical sources has long been considered a signature of cosmic-ray acceleration. The IceCube neutrino observatory has observed a diffuse flux of TeV-PeV neutrinos, but very few confirmed sources have emerged. With the recent publication of IceCube Event Catalog (IceCat-1), IceCube has released a list of the most promising astrophysical neutrino events since May 2011. Using the archival data from the High Altitude Water Cherenkov (HAWC) \$\$-ray observatory, we perform a coincidence search for gamma rays and neutrinos using a Bayesian Block algorithm with the public IceCube alerts from IceCat-1, along with additional alerts issued later. In this work, we consider 368 alerts, up to July 8, 2025, that are within HAWC's field of view. We observe approximately a 5\\% coincident detection rate, which is consistent with expectations from background. Two of these detections contain the Active Galactic Nuclei (AGN) Markarian 421 and Markarian 501. We discuss the likelihood that the neutrino/\$\$-ray coincidences are false positives and a brief overview of the results.

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Publisher

Cornell University Library, arXiv.org

Subject

Active galactic nuclei