# Investigating the effect of sensitivity of KAGRA on sky localization of gravitational-wave sources from compact binary coalescences

Source: [Investigating the effect of sensitivity of KAGRA on sky localization of gravitational-wave sources from compact binary coalescences](<https://www.sota2.com/research/paper/69e06d267d0172140ec7cb9f>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2026-04-17T05:00:04.441Z

Authors: Alvin K. Y. Li, Peony K. K. Lai, Elwin K. Y. Li, Otto A. Hannuksela

Published: 2026-04-15T07:39:32.000Z

## Abstract

The addition of KAGRA to the global gravitational-wave detector network introduces new baselines and complementary antenna response patterns that can enhance sky localization for compact binary coalescences. We investigate KAGRA's role in the LIGO-Virgo-KAGRA network using a systematic injection study of binary neutron star signals. Sky maps are constructed with a radiometric, coherence-based framework, allowing isolation of geometric and timing contributions from individual detectors. Localization performance is quantified using the fraction of events localized within $100~\\mathrm{deg}^2$, cumulative area distributions, and the median $90%$ credible region.   We also assess KAGRA's impact on detection rates by varying its sensitivity over a wide range. Even at its current sensitivity of $\\sim10~\\mathrm{Mpc}$, KAGRA provides measurable improvements by breaking degeneracies through additional baselines and directional constraints. As sensitivity increases, improvements in signal-to-noise ratio and timing precision lead to substantial reductions in localization area. We identify a binary neutron star range of $\\sim30~\\mathrm{Mpc}$ as a practical benchmark for reliable localization suitable for electromagnetic follow-up, noting this as a conservative estimate.   In addition, KAGRA increases the number of detectable events by enabling lower signal-to-noise detections. These results demonstrate that even a modest-sensitivity detector can significantly enhance network performance through geometric complementarity, highlighting the importance of a geographically distributed network for multimessenger gravitational-wave astronomy.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/2604.13580>)

[PDF](<https://arxiv.org/pdf/2604.13580.pdf>)