The exploration of the universe has recently entered a new era thanks to the multi-
messenger paradigm, characterized by a continuous increase in the quantity and quality of …

The discovery of high-energy astrophysical neutrinos and the first hints of coincident
electromagnetic and neutrino emissions opened new opportunities in multi-messenger …

Next-generation neutrino telescopes with substantially improved sensitivity are required to
pinpoint the sources of the diffuse astrophysical neutrino flux detected by IceCube and …

Some Seyfert galaxies are detected in high-energy gamma rays, but the mechanism and site
of gamma-ray emission are unknown. Also, the origins of the cosmic high-energy neutrino …

The origin of cosmic high-energy neutrinos remains largely unexplained. For high-energy
neutrino alerts from IceCube, a coincidence with time-variable emission has been seen for …

Cosmic rays were first discovered over a century ago, however the origin of their high-
energy component remains elusive. Uncovering astrophysical neutrino sources would …

Many instruments for astroparticle physics are primarily geared towards multi-messenger
astrophysics, to study the origin of cosmic rays and to understand high-energy astrophysical …

ABSTRACT The Zwicky Transient Facility (ZTF) performs a systematic neutrino follow-up
programme, searching for optical counterparts to high-energy neutrinos with dedicated …

Abstract The IceCube Neutrino Observatory sends realtime neutrino alerts with a high
probability of being astrophysical in origin. We present a new method to correlate these …

Active Galactic Nuclei (AGN) are sources of high-energy γ-rays and are considered to be
promising candidates to be sources of high-energy cosmic rays and neutrinos as well. We …