Speaker
Description
Merging compact objects are expected to be high-energy multi-messenger sources. During the merger, cosmic rays can be accelerated to high energies, and the subsequent interactions of these particles are expected to produce high-energy neutrinos. The IceCube Neutrino Observatory follows up all events detected by the LIGO-Virgo-KAGRA gravitational-wave detectors that are sent publicly in real time. Track-like neutrino events have a better angular resolution than gravitational-wave events and thus provide a much smaller search area for follow up, improving the likelihood of observing the multi-messenger source. This talk will discuss two IceCube real-time analysis pipelines used to search for high-energy neutrinos coincident with gravitational-wave events. The results of these analyses are sent to the astrophysical community with low latency to facilitate targeted follow-up observations by other telescopes. We present the latest constraints from these searches during the recent fourth observing run of the gravitational-wave detectors.