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Review readiness: S5y2/VSR1 all-sky search using Coherent WaveBurst

Review readiness presentation - October 1, 2008

What is the scientific purpose of this analysis project

All-sky, untriggered burst search for arbitrary GW signals with frequency content up to 2 kHz, using the LIGO data from the second year of S5 along with the Virgo data from VSR1.

What are the goals in terms of publications and/or conferences

The results will be combined with that of other algorithms, and published in a single paper, following the recipe identified for the S5y1 all-sky burst search.

How the result is expected to be presented

An upper limit on the rate of gravitational wave bursts as a function of amplitude for a variety of tested waveforms that roughly cover the targeted signal space.

An overview of the analysis pipeline (one slide or less)

The analysis method is the same as was used for the Coherent WaveBurst portion of the S5 first-year all-sky search. Coherent WaveBurst is used to process the data streams from two or more detectors; triggers are generated and characterized by a few quantities, mainly the effective network snr, ρ; backgrounds are estimated using time-shifts.

How mature is the analysis, e.g. have all pipeline parameters been chosen, have preliminary or final sensitivities been evaluated, has the box been opened, etc.

As of October 1, the analysis is essentially complete. Thresholds and other pipeline parameters have been chosen and the box has been opened for almost all of the data; there are just a few small data sets remaining to be opened. Final sensitivities have been evaluated.

Summarize any results and/or conclusions from the analysis that have been obtained so far

One event candidate (the "equinox event") survives all analysis cuts and vetoes. It is clearly an outlier, but not quite significant enough to claim as a GW signal detection.

How does this analysis compare to previous or concurrent analyses in terms of sensitivity, observation time, etc.

The sensitivity is similar to what was obtained using Coherent WaveBurst in the first year of S5 data, with similar observation time.

What remains to be done to complete the end-to-end analysis e.g. tuning parts of the pipeline, opening the box, etc.

For some small data samples, amounting to a few days of observation time, final thresholds still need to be set and the box opened.

Certify that the project summary web page is up-to-date (i.e. on )

Yes, it is now.

Where the technical documentation may be found

Here: Project summary page

That the technical documentation is complete and up-to-date (a listing of its sections may be helpful)

There are many links on the project summary page

Where the software, including pre- and post-processing scripts, may be found, i.e. in which CVS repository maintained by DASWG and with what CVS tag has the analysis been done

The software is in the GDS CVS repository at Caltech; see this link. The version used for this analysis has the tag wat-4.7.0 . The same code was used for the S5y2/VSR1 analysis as for the S5y1 analysis, with very minor cosmetic differences. The main change is that, for the S5y2/VSR1 analysis, a new driver script was written to handle all of the different networks, but following the same logic as was used in S5y1 (when there were separate scripts for the different networks).

Where the configuration files and data products from the analysis are posted for inspection

See the various links on the project summary page.

What has been done so far in the way of reviewing the analysis and/or the software

The long-running LSC review of the Coherent WaveBurst algorithm and the S5y1 analysis has carried over, to some extent, to reviewing the S5y2/VSR1 analysis.

IF a paper draft has been written: How complete/mature is it

No paper draft has been written yet.
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