Detecting Gravitational-Wave Transients at 5σ: A Hierarchical Approach

Eric Thrane, Michael Coughlin

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


As second-generation gravitational-wave detectors prepare to analyze data at unprecedented sensitivity, there is great interest in searches for unmodeled transients, commonly called bursts. Significant effort has yielded a variety of techniques to identify and characterize such transient signals, and many of these methods have been applied to produce astrophysical results using data from first-generation detectors. However, the computational cost of background estimation remains a challenging problem; it is difficult to claim a 5σ detection with reasonable computational resources without paying for efficiency with reduced sensitivity. We demonstrate a hierarchical approach to gravitational-wave transient detection, focusing on long-lived signals, which can be used to detect transients with significance in excess of 5σ using modest computational resources. In particular, we show how previously developed seedless clustering techniques can be applied to large data sets to identify high-significance candidates without having to trade sensitivity for speed.

Original languageEnglish (US)
Article number181102
JournalPhysical review letters
Issue number18
StatePublished - Oct 27 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 American Physical Society. © 2015 American Physical Society.


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