A Cross-correlation method to search for gravitational wave bursts with AURIGA and Virgo

TL;DR

This paper introduces a cross-correlation method for detecting gravitational wave bursts by combining data from the AURIGA bar detector and Virgo interferometer, enhancing detection sensitivity through network analysis.

Contribution

The paper presents a novel cross-correlation analysis technique for joint gravitational wave searches using diverse detector types, improving detection capabilities over traditional methods.

Findings

Method successfully tested on one day of data from AURIGA and Virgo.

Compared performance with stand-alone coincidence search, showing advantages.

Discussed potential for future joint detector analyses.

Abstract

We present a method to search for transient GWs using a network of detectors with different spectral and directional sensitivities: the interferometer Virgo and the bar detector AURIGA. The data analysis method is based on the measurements of the correlated energy in the network by means of a weighted cross-correlation. To limit the computational load, this coherent analysis step is performed around time-frequency coincident triggers selected by an excess power event trigger generator tuned at low thresholds. The final selection of GW candidates is performed by a combined cut on the correlated energy and on the significance as measured by the event trigger generator. The method has been tested on one day of data of AURIGA and Virgo during September 2005. The outcomes are compared to the results of a stand-alone time-frequency coincidence search. We discuss the advantages and the limits of this approach, in view of a possible future joint search between AURIGA and one interferometric detector.