LIGO Document P1100118-v24

All-sky search for gravitational-wave bursts in the second joint LIGO-Virgo run

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We present results from a search for gravitational-wave bursts in the data collected by the LIGO and Virgo detectors between July 7, 2009 and October 20, 2010: data are analyzed when at least two of the three LIGO-Virgo detectors are in coincident operation, with a total observation time of 207 days. The analysis searches for transients of duration 1 s over the frequency band 645000 Hz, without assumptions on the signal waveform, polarization, direction or occurrence time. No events pass the threshold in false alarm rate of ~ 1/3 yrs: all identified events are consistent with the expected accidental background. We set frequentist upper limits on the rate of gravitational-wave bursts by combining this search with the previous LIGO-Virgo search on the data collected between November 2005 and October 2007. The upper limit on the rate of strong gravitational-wave bursts at the Earth is 1.3 events per year at 90% confidence. We also present upper limits on source rate density per year and Mpc3 for sample populations of standard-candle sources. As in the previous joint run, typical sensitivities of the search in terms of the root-sum-squared strain amplitude for these waveforms lie in the range ~ 5 10^-22 Hz^-1/2 to ~ 1 10^-20 Hz^-1/2 . The combination of the two joint runs entails the most sensitive all-sky search for generic gravitational-wave bursts and synthesizes the results achieved by initial generation interferometric detectors.
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