LIGO- G030441-00-Z Update on standalone power burst- detection code Patrick Brady University of Wisconsin-Milwaukee.

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Presentation transcript:

LIGO- G Z Update on standalone power burst- detection code Patrick Brady University of Wisconsin-Milwaukee

LIGO- G Z 08/20/03LIGO Scientific Collaboration - UWM1 Excess-power method Fourier based time- frequency method. Calculates time-frequency planes at multiple resolutions Computes power in tiles defined by a start-time, duration, low-frequency, frequency band Search over all tiles satisfying user supplied criteria for excess power GW Channel + simulated bursts

LIGO- G Z 08/20/03LIGO Scientific Collaboration - UWM1 lalapps_power Uses same code base as DSO’ Need LAL, LALApps, framelib, fftw Reads frame data directly; writes LIGO lightweight tables out. Uses generic functionality in LAL: » Frame reading interface » Calibration extraction » MetaTable output routines » PSD estimation

LIGO- G Z 08/20/03LIGO Scientific Collaboration - UWM1 Recent enhancements Can limit the max. tile band independently of the band over which to search Search algorithm whitens using Uses robust median estimator for power spectrum S(|f|) which » Tracks non-stationarity » Is not biased by non-Gaussian bursts w(f)= v(f)/sqrt[ S(|f|) ]

LIGO- G Z 08/20/03LIGO Scientific Collaboration - UWM1 Mean versus Median Estimators Results by Mark Williamson

LIGO- G Z 08/20/03LIGO Scientific Collaboration - UWM1 Running the code Can run on desktop reading data from a directory Can run under Condor accessing more resources Examples of running: » H1: 100hrs of playground – 44 mins on medusa » H2: 76 hrs of playground – 26 mins on medusa » L1: 42 hrs of playground – 16 mins on medusa Results by Denny Mackin

LIGO- G Z Concluding remarks Standalone power code is available Further enhancements are coming soon Can be run under Condor to analyze LIGO data Investigations of hardware injections are under way Investigations for burst group under way Denny Mackin Saikat Ray-Majumder