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 http://www.lsc-group.phys.uwm.edu/bursts/projects/ )
Yes, it is now.
Where the technical documentation may be found
That the technical documentation is complete and up-to-date
(a listing of its sections may be helpful)
There are many links on
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;
. 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
Where the configuration files and data products from the analysis
are posted for inspection
See the various links on
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
IF a paper draft has been written: How complete/mature is it
No paper draft has been written yet.