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Status of the joint LIGO–TAMA300 inspiral analysis

Stephen Fairhurst1 (for the LIGO Scientific Collaboration), Hirotaka Takahashi2 and3 (for the TAMA Collaboration)

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We present the status of the joint search for gravitational waves from inspiraling neutron star binaries in the LIGO Science Run 2 and TAMA300 Data Taking Run 8 data, which were taken from 14 February to 14 April 2003, by the LIGO and TAMA Collaborations. In this paper, we discuss what has been learned from an analysis of a subset of the data sample reserved as a 'playground'. We determine the coincidence conditions for parameters such as the coalescence time and chirp mass by injecting simulated Galactic binary neutron star signals into the data stream. We select coincidence conditions so as to maximize our efficiency of detecting simulated signals. We obtain an efficiency for our coincident search of 78% and show that we are missing primarily very distant signals for TAMA300. We perform a time-slide analysis to estimate the background due to accidental coincidence of noise triggers. We find that the background triggers have a very different character from the triggers of simulated signals.


PACS

04.80.Nn Gravitational wave detectors and experiments

97.60.Jd Neutron stars

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

07.05.Kf Data analysis: algorithms and implementation; data management

97.80.-d Binary and multiple stars

MSC

85A05 Galactic and stellar dynamics

83C35 Gravitational waves

68P15 Database theory

Subjects

Instrumentation and measurement

Gravitation and cosmology

Astrophysics and astroparticles

Dates

Issue 18 (21 September 2005)

Received 31 March 2005, in final form 17 May 2005

Published 6 September 2005



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