Status of the O4 run and latest non-CBC results

TL;DR

The paper reviews the status of the ongoing O4 gravitational wave observing run, discusses detector performance and noise reduction techniques, and reports on latest results from non-compact binary coalescence searches, with no detections yet.

Contribution

It provides an update on the O4 run status, including detector performance and noise mitigation, and summarizes recent non-CBC gravitational wave search results.

Findings

O4 detectors are operational with ongoing performance improvements.

Noise removal techniques, including AI methods, enhance sensitivity.

No non-CBC gravitational wave detections have been confirmed yet.

Abstract

The fourth observing run (O4) of Advanced LIGO, Virgo, and KAGRA has started in May 2023 and is planned to continue until October 2025. On behalf of the LVK Collaboration, I will cover two topics: Status of the O4 run and latest non-CBC results. Status of the O4 run. The focus will be on detectors' performance and online searches/alerts, drawing on publicly available sources provided by the collaboration. Additionally, I will give an overview of removing noise techniques, including AI approaches that help gain sensitivity at a small cost. Latest non-CBC results. Compact Binary Coalescence (CBC) is just one of the potential GW sources: Continuous Waves, Bursts, and Stochastic are still being hunted down. Here, O4 public results of searches will be presented, or the latest O3 will be discussed when the former are not yet available. So far, no GW detections have been associated with these non-CBC sources in any of the searches conducted.