LIGO-G1400501-v2 Recovering Burst Injections in LIGO S5 Data Alex Cole Data Analysis Meeting May 6, 2014.

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Presentation transcript:

LIGO-G v2 Recovering Burst Injections in LIGO S5 Data Alex Cole Data Analysis Meeting May 6, 2014

LIGO-G v2 Motivation LOSC – LIGO’s commitment to open science S5 Science Run ( ) »“strain” files at 4096 Hz Injections – test the pipeline, calibrate detectors Interesting computational task of finding signal in noise Previous work on CBC injections – Ashley Disbrow LIGO Laboratory2

LIGO-G v2 LIGO Laboratory3 Injections Types: »Sine-Gaussian »Gaussian »Zwerger-Mueller »Ringdown »Cosmic string cusp »White noise burst Parameters: »GPS time, offset »Scale »Log message –Successful –Not in Science Mode –Injection Process Off –GRB-Alert –Injection Compromised

LIGO-G v2 Finding a GW Signal Matched filter »Perform weighted cross-correlation in frequency domain »Weight by inverse of noise power LIGO Laboratory4

LIGO-G v2 Matched Filter Search Generate template (and FFT) Grab PSD of noisy data LIGO Laboratory5

LIGO-G v2 Matched Filter Search – Part 2 Cross-correlate with noise weight IFFT and normalize  SNR LIGO Laboratory6

LIGO-G v2 Techniques: Templates Template generation »Many types! »Python, downsampling LIGO Laboratory7

LIGO-G v2 Techniques: Efficiency Efficiency overhaul »60,000 burst injections! (cf. 1,492 “successful” CBC injections) –4 hours vs. 1 week »Group injections (<200 seconds to next neighbor) »Groups of 3-36 LIGO Laboratory8

LIGO-G v2 Results – Successful Injections 1 LIGO Laboratory9

LIGO-G v2 Results – Successful Injections 2 LIGO Laboratory10

LIGO-G v2 Outliers Omega scans “ H1 MASTER OVERFLOW LSC ” SNR ~ 5000, expSNR much smaller Conclusion: control system overwhelmed LIGO Laboratory11 Good Bad

LIGO-G v2 Outliers 2 “Injection compromised” flag Injection process off LIGO Laboratory12

LIGO-G v2 Future Work Results: Stochastic injections Efficiency (PSDs) Work on tutorials – LOSC Release S5 bulk data Move on to S6… LIGO Laboratory13

LIGO-G v2 Acknowledgments Jonah Kanner – LIGO, Caltech Alan Weinstein – LIGO, Caltech Ashley Disbrow – Carnegie Mellon Peter Shawhan – LIGO, U. Maryland Thomas Moore – Pomona College Greg Ogin – Whitman College LIGO Laboratory14