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A comparison of methods for gravitational wave burst searches from LIGO and Virgo

F Beauville1, M-A Bizouard2, L Blackburn3, L Bosi4, L Brocco5, D A Brown6,7, D Buskulic1, F Cavalier2, S Chatterji6, N Christensen8,9, A-C Clapson2, S Fairhurst7, D Grosjean1, G Guidi10, P Hello2, S Heng11, M Hewitson11, E Katsavounidis3, S Klimenko12, M Knight8, A Lazzarini6, N Leroy2, F Marion1, J Markowitz3, C Melachrinos3, B Mours1, F Ricci5, A Viceré10, I Yakushin13 and M Zanolin3 (The joint LSC/Virgo working group)

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The search procedure for burst gravitational waves has been studied using 24 h of simulated data in a network of three interferometers (Hanford 4 km, Livingston 4 km and Virgo 3 km are the example interferometers). Several methods to detect burst events developed in the LIGO Scientific Collaboration (LSC) and Virgo Collaboration have been studied and compared. We have performed coincidence analysis of the triggers obtained in the different interferometers with and without simulated signals added to the data. The benefits of having multiple interferometers of similar sensitivity are demonstrated by comparing the detection performance of the joint coincidence analysis with LSC and Virgo only burst searches. Adding Virgo to the LIGO detector network can increase by 50% the detection efficiency for this search. Another advantage of a joint LIGO–Virgo network is the ability to reconstruct the source sky position. The reconstruction accuracy depends on the timing measurement accuracy of the events in each interferometer, and is displayed in this paper with a fixed source position example.


PACS

04.80.Nn Gravitational wave detectors and experiments

98.70.Rz &ggr;-ray sources; &ggr;-ray bursts

95.55.Ym Gravitational radiation detectors; mass spectrometers; and other instrumentation and techniques

07.60.Ly Interferometers

MSC

83C35 Gravitational waves

85A15 Galactic and stellar structure

78A60 Lasers, masers, optical bistability, nonlinear optics (See also 81V80)

Subjects

Instrumentation and measurement

Gravitation and cosmology

Astrophysics and astroparticles

Dates

Issue 4 (21 February 2008)

Received 20 June 2007, in final form 28 November 2007

Published 31 January 2008



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