LIGO Document G0900348-v1

Estimating the Accidental Coincidence Rates in Searches for Gravitational Waves from Compact Binary Coalescences with LIGO

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In order to estimate accidental coincidence rates for the gravitational wave candidates found at the
end of LIGO's inspiral search pipelines, the method of time-shifted data is used, where a number of
time-shifted data streams are analyzed to provide accidental coincidence rates for candidates with a
given signal-to-noise ratio. This method has limitations, including underestimation of H1H2
accidental coincidence rates and poor estimation of rates for high signal-to-noise ratio candidates.
We will present a proposal for improving the estimation of accidental coincidence rates, using the
rate of triggers found in each detector before coincidence is used.
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