Enhanced long-duration gravitational-wave transient sources search pipeline with denoising and tree clustering algorithms

2025/08/29 by H. Einsle, M. A. Bizouard, Einsle, Hugo +3
Computer Science · Engineering · Physics and Astronomy · #Advanced Electrical Measurement Techniques #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Astrophysical Phenomena (astro-ph.HE) #Instrumentation and Methods for Astrophysics (astro-ph.IM) #Pulsars and Gravitational Waves Research #Time Series Analysis and Forecasting

paper · pdf · doi:10.48550/arxiv.2509.00274

openalex publication_date 2025/08/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We present a two-stage upgrade to the PySTAMPAS pipeline that boosts the search for long-duration (10 to 10³ s) transients in gravitational-wave detector data. First, a denoising scheme combines complex 2D wavelet shrinkage with an adaptive pixel threshold to suppress noise while retaining signal power. Second, a KDTree nearest-neighbour algorithm clusters surviving pixels in O(log n) time, replacing the standard clustering approach. Tests with one week of LIGO O3b data show a large reduction in false-alarm rate and up to a factor-of-two improvement in search sensitivity. The computational time is also significantly reduced. These gains extend the sensitivity of all-sky, all-time searches to weaker and shorter transients, enabling rapid and deeper analyses in forthcoming LIGO-Virgo-KAGRA observation campaigns.

Citations

• All-sky search for long-duration gravitational-wave transients in the first part of the fourth LIGO-Virgo-KAGRA Observing run
• Search for gravitational-wave transients associated with magnetar bursts in Advanced LIGO and Advanced Virgo data from the third observing run
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• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Observation of Gravitational Waves from a Binary Black Hole Merger
• Ideal spatial adaptation by wavelet shrinkage
• An Algorithm for Finding Best Matches in Logarithmic Expected Time
• Multidimensional binary search trees used for associative searching

Related

• Searches for long-duration gravitational wave transients in LIGO and Virgo data
• All-sky search for long-duration gravitational-wave transients in the first part of the fourth LIGO-Virgo-KAGRA Observing run
• Low Latency transient search of Gravitational Waves for the Advanced Detectors
• A Neural Network-Based Search for Unmodeled Transients in LIGO-Virgo-KAGRA's Third Observing Run
• Optimizing searches for gravitational wave bursts using coherent WaveBurst 2G