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Review Committee Meeting Monday 19 November 2007 08:00 Pacific / 11:00 Eastern

Minutes: Monday 19 November 2007 08:00 Pacific / 11:00 Eastern

Agenda and Contact Info

Agenda

  1. GWDAW Abstracts [ HTML ]
  2. Review of BurstMDC Simulation
    • The GravEn source code in the BurstMDC release [ HTML ]
  3. A.O.B.

Contact Info

InterCall telecon service:
   Phone: 1-866-380-5536, participant code: 435 672 9587 #
   International callers ++1-816-249-4731 with same code
   International access numbers (~10 cents/min surcharge for LIGO Lab):
      Paris 017 080 7156 ;
      Lyon 042 603 0036 ;
      Germany toll-free 0800 182 1591 ;
      Berlin 030 726 167 371 ;
      Rome 00645 217 080 ;
      UK toll-free 0808 234 7914 ;
      London 0203 107 0293
   Handy participant command:  Press *6 ["*M"] to mute, #6 to unmute

Minutes

From section on presentations on behalf of LSC and/or Virgo:

	• Search for a Gravitational-Wave Burst Associated with GRB 070201  
using LIGO Data (talk)
Author: Isabel Leonor for the LSC
Abstract: We present results of a search for a gravitational-wave  
burst (GWB) associated with GRB 070201 -- a short, hard gamma-ray  
burst whose position error box directionally overlapped the  
Andromeda Galaxy -- using data from the fifth LIGO science run. We  
discuss the relevance of the search results to a model in which the  
gamma-ray source is a soft gamma repeater (SGR) in the Andromeda  
Galaxy. We also show how the GWB search provides an independent way  
to confirm the null result from an optimal template-based search for  
gravitational waves from a compact binary progenitor in Andromeda.  
Finally, we present the sample of GRBs which can be used as external  
triggers to search for associated gravitational wave signals using  
data from the fifth LIGO science run.
Data usage: Yes
Review status: Preprint posted

LSC burst review committee is comfortable with this abstract:
this is already reviewed material.
There will need to be a (hopefully brief) review of the content.


	• Overview of LSC-Virgo externally-triggered searches (talk)
Author: (Speaker TBD) for the LIGO and Virgo Collaborations
Abstract: Gamma-ray, X-ray, optical or neutrino observations of  
cataclysmic cosmic events with plausible gravitational wave emission  
can be used to constrain searches for gravitational waves in LIGO  
and VIRGO data. Information on the progenitor, such as trigger time,  
expected frequency range and direction, can enhance our ability to  
identify gravitational wave signatures with amplitude close to the  
noise floor of the detector with a low false alarm probability. Even  
in the absence of detection, the association of the astrophysical  
trigger with a particular source distance allows to interpret upper  
limits on the observed flux of gravitational waves in terms of the  
energy emitted in form of gravitational waves. After a summary of  
ongoing analyses and plans for the future, the talk will focus on  
the results set by LIGO on gravitational waves coincident with  
events detected via electromagnetic observations.
Data usage: No, just methods and plans?
Review status: ?


LSC burst review committee is comfortable with this abstract.
*** Virgo committee needs to approve! ***
There will ned to be a (hopefully brief) review of the content.


	• All-Sky Burst Search in the First Year of the LSC S5 Run (talk)
Author: Laura Cadonati for the LSC
Abstract: The all-sky search for unmodeled bursts of gravitational  
waves targets transient signatures whose waveform and origin are not  
well known, such as core-collapse supernovae or binary black hole  
mergers. It follows an ``eyes-wide-open'' philosophy, aimed to  
maximize the search sensitivity with minimal assumptions on the  
signal source and morphology. The LSC Burst analysis group developed  
and implemented different techniques for this search, all of which  
rely on the ability to find simultaneous, statistically significant  
excesses of power in two or more interferometers, including coherent  
techniques, consistency criteria, veto conditions and signal  
reconstruction, for an effective suppression of false alarms. This  
talk will provide an overview of how these techniques are used in  
the analysis of data from the first calendar year of the LSC S5 run,  
between November 2005 and November 2006, and report on the expected  
sensitivity of the search.
Data usage: Preliminary sensitivities as shown at APS and Amaldi
Review status: Reviewed for Amaldi


LSC burst review committee is comfortable with this abstract:
Only already-approved sensitivities are to be shown.
There will ned to be a (hopefully brief) review of the content.


	• LSC-Virgo joint burst search (talk)
Author: Nicolas Leroy for the Virgo and LIGO Collaborations
Abstract: For the first time LIGO (end of S5) and Virgo had a  
several months common run for a long scientific run from mid-May  
2007 up to end of September 2007. During this period, up to five  
large interferometers have operate as a global network. The LIGO- 
Virgo Burst group starts working on one week of data at beginning of  
August 2007 to test different analysis. We will present here a first  
look at the LSC-Virgo network data with different methods : full sky  
coherent method (coherent WaveBurst), coincident analysis using a  
Peak Correlator (Gaussian templates) or Q-pipeline, with a coherent  
follow up of candidates (Xpipeline).
Data usage: Some first-look things like trigger rates, maybe?
Review status: Needs to be checked to make sure content does not go  
too far.


LSC burst review committee is comfortable with this abstract.
*** Virgo committee needs to approve! ***
Content will need to be reviewed - we would like to see what
will be shown ASAP to head-off any last minute crises.

	• The Role of Data Quality in S5 Burst Analyses (poster)
Authors: L. Cadonati for the LSC
Abstract: An important ingredient in the search for unmodeled bursts  
of gravitational waves is the identification and rejection of data  
segments with unreliable detector response or with an abnormally  
large rate of noise transients. The LSC Detector Characterization  
team has identified several data quality features that should be  
accounted for in the analysis of data from the LIGO S5 run. This  
poster describes how this information is used, with an overview of  
the veto strategy, the classification of different veto conditions,  
and a discussion of their impact on the rate of transients in  
individual interferometers and in a coincident burst search.
Data usage: Yes, to illustrate data quality issues and effects of cuts
Review status: Not needed (?)


LSC burst review committee is comfortable with this abstract,
but should be modified to indicate that this is based on
first-year (hence pre 18 May 2007) data.
We would ask LSC DetChar group to review content as well as
the burst review committee.
Some question of authorship.

	• Analysis of nonstationarity in LIGO S5 data using the  
NoiseFloorMon output (poster) - proposal for a seismic data quality  
flag
Authors: R. Stone for the LIGO Scientific Collaboration
Abstract: NoiseFloorMon is a DMT monitor that analyzes LIGO data for  
slow nonstationarity. This poster presents results from the S5 run.  
The study focuses on long term nonstationary behavioral correlation  
seen between the gravitational wave channels and the seismic  
channels in different frequency bands. Development of a seismic data  
quality flag based on these studies is also presented.
Data usage: Yes, but only looks at slow nonstationarities in the GW  
and seismic data channels for the purpose of correlating them
Review status: Not needed


LSC burst review committee is comfortable with this abstract,
but should be modified to indicate that this is based on
first-year (hence pre 18 May 2007) data.
*** PLEASE CONFIRM ***
We would ask LSC DetChar group to review content as well as
the burst review committee.


	• Multidimensional classification analysis of kleine Welle triggers  
in LIGO S5 run (poster): complete pipeline automation and results  
from the extended and targeted analysis
Authors: S. Mukherjee for the LIGO Scientific Collaboration
Abstract: A fully automated optimized multidimensional  
classification pipeline has analyzed complete LIGO S5 kleine Welle  
trigger data from all channels. This poster presents the details of  
the pipeline and results from the extended and targeted analysis.  
The extended analysis focuses on details of trigger classes and  
inferences therein. The targeted analysis focuses on triggers that  
fall within a window around GPS times of special interest.  
Implications based on both types of analysis are discussed.
Data usage: Yes, including the GW channels, but only for the purpose  
of discussing the classification of triggers from individual channels.
Review status: Not needed


LSC burst review committee is comfortable with this abstract,
but should be modified to indicate that this is based on
first-year (hence pre 18 May 2007) data.
*** PLEASE CONFIRM ***
We would ask LSC DetChar group to review content as well as
the burst review committee.  Some concerns about content
were raised so we would like to see what is to be presented
ASAP to head-off any last minute crises.

	• Burst detection checklist and follow-up plans (poster) ?
Authors: (Lead TBD) for the LIGO and Virgo Collaborations
Abstract: ...
Data usage: Only incidentally to make some illustrative figures
Review status: Not needed?


Withdrawn.

	• High Frequency Search for Gravitational Wave Bursts with the LSC  
and Virgo Detectors (poster)
Authors: Brennan Hughey, Michele Zanolin and Erik Katsavounidis for  
the LSC and Virgo Collaborations
Abstract: We present a first look at an all-sky gravitational wave  
burst search in the frequency range 1 to 6.5 kHz. Previous burst  
searches with ground-based interferometers have been limited to  
frequencies below 2 kHz. However, various models predict  
gravitational wave emission in the several kiloHertz range from  
astrophysical phenomena including gravitational collapse, neutron  
star modes and low mass black hole mergers. This shot-noise  
dominated frequency regime can be analyzed with the same tools as  
lower frequency analyses. We will discuss properties of the noise in  
this regime and take a first look at sensitivities.
Data usage: Properties of the noise; Sensitivity plot with a few  
sine-Gaussian efficiency curves; some time series of events
Review status: Not yet reviewed


Significant discussion.  It was pointed out that the proposal
is to use a single day of S4 playground.  This would still
require a review.  Options:

1. Use simulated data only.  Multi-author, not "For LSC" poster
   should include all people involved in the work.  The burst
   group would need to be consulted in constructing author list.

2. Single-Author-for-the-LSC.  Make it clear that only first
   year of S5 data is used.  Change title to:
   "High Frequency Search for Gravitational Wave Bursts".
   Sensitivities would need to be reviewed.  We would like to
   see what is to be presented ASAP to head-off any last minute
   crises.

3. Single-Author-for-the-LSC-and-Virgo.
   *** Virgo approval would be needed ***
   Sensitivities would need to be reviewed by both LSC and Virgo
   reviewers.  We would like to see what is to be presented ASAP
   to head-off any last minute crises.


We only looked at two of the other burst and burst-related
presentations.  The PP committee needs to approve that these
do not need to be "for the LSC (and possibly Virgo)"
presentations.


	• Distributional tests for gravitational wave transient event  
detection
Authors: Yeming Shi, Michele Zanolin and Erik Katsavounidis
Abstract: We present non-parametric distributional tests as a way to  
identify gravitational wave transient events present in  
interferometric data. The tests compare the shape of distributions  
of signal strength of foreground and background events and establish  
the degree of similarity. A confidence level-based detection  
criterion is thus derived. We use Monte Carlo methods to study the  
performance of these tests using several models for a hypothetical  
population of gravitational wave sources. We present the efficiency  
of and compare the tests as a function of the strength and number of  
the simulated events. We also confront these distributional tests to  
the counting-based event searches that have been traditionally  
employed in the transient searches with ground-based gravitational  
wave detectors. We find that for certain source models the  
distributional tests outperform the counting-based searches.
Data usage: In its current version, the study has used a  
phenomenological fit to the signal strength of glitches as  
identified by KleineWelle during the S5 run. This fit is used in  
order to generate simulations of the event background.
Review status:


Only GW data product to be used was drawn from LSC presentations
that are public.  If fits are done to these plots, then a reference
to the plot is sufficient.  That is: if this is equivalent to
what people outside the LSC could do based on public domain data,
then it should be OK to have a short author list.

Would be somewhat more palatable if it were from an actual published
data set (S2, S3, or S4).

PP committee requests a formal petition and will have final say.

	• Coordinated Observations of Sco X-1 with Gravitational-wave  
detectors and the Rossi X-ray Timing Explorer
Authors: J. Markowitz (1), S. A. Hughes (1), J. G. Jernigan (2), E.  
Katsavounidis (1), A. M. Levine (1), C. Messenger (3), E. Morgan  
(1), S. Rappaport (1)
(1) MIT, (2) UC Berkeley, (3) Albert Einstein Institute

Abstract: We have conducted coincident observations of the brightest  
extrasolar X-ray source, Sco X-1, and other Low Mass X-ray Binaries  
(LMXBs) with the Rossi X-ray Timing Explorer (RXTE) and the network  
of gravitational-wave interferometers (LIGO, GEO, Virgo). Sco X-1 is  
an attractive target due to its strong X-ray emission, close  
proximity, and the existence of quasi-periodic oscillations (QPOs)  
in its X-ray flux that are within the band of sensitivity of  
interferometric detectors. A series of dedicated RXTE observations  
were conducted in conjunction with LIGO/GEO's fifth science run (S5)  
and Virgo's first science run (VSR1). This is the first effort  
between electromagnetic and gravitational wave observatories for  
coordinated analysis of their data. We present a cross correlation  
method to search for both transient events and longer duration  
periodic signals. The method uses the X-ray light curve from RXTE as  
a template for possible gravitational wave signatures in the  
interferometric data. Beyond searches for gravitational waves using  
these coordinated observations, we may use all X-ray data in hand to  
seek as yet undiscovered long term coherent pulsations that could  
determine the spin frequency of Sco X-1. We show livetime statistics  
of the coordinated observations as well as initial correlation  
studies using simulated interferometric and real RXTE data that  
demonstrate the sensitivity of the approach.
Data usage: ??
Review status: ??




Either the first sentence of the abstract needs to be changed or this
has to be a for-the-LSC/Virgo paper!  It is the LSC+Virgo+others that  
has
performed the search, not just the authors listed.

Livetime statistics are probably OK if used in aggregate.  Otherwise,
just use duty cycle percentages to estimate total livetime.

PP committee requests a formal petition and will have final say.
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