Presentation is loading. Please wait.

Presentation is loading. Please wait.

For the Collaboration GWDAW 2005 Status of inspiral search in C6 and C7 Virgo data Frédérique MARION.

Similar presentations


Presentation on theme: "For the Collaboration GWDAW 2005 Status of inspiral search in C6 and C7 Virgo data Frédérique MARION."— Presentation transcript:

1 for the Collaboration GWDAW 2005 Status of inspiral search in C6 and C7 Virgo data Frédérique MARION

2 GWDAW C6 & C7 runs C6  14 days  86% duty cycle (in science mode)  Factor 2 variation in the horizon over the course of the run C7  5 days  65% duty cycle  Detector sensitivity also not stationary Optimally oriented [1.4,1.4] M  (SNR=8)

3 GWDAW Inspiral online analysis Both pipelines, Merlino and MBTA, ran online during C6 and C7, getting data from online h-reconstruction  Monitoring information provided »Lists of loudest events »Plots for monitoring web pages MBTA Hardware injections

4 GWDAW C6 hardware injections 56 inspiral hardware injections  4 different periods, [1.4,1.4] M , SNR ranging from ~15 to 25 All detected  Check timing and mass estimation accuracy  Check SNR recovery ~ 10% loss might be due to sensitivity non-stationarity MBTA

5 GWDAW C7 hardware injections 2 periods of inspiral injections  [1.32, 1.36] M , SNR ~ 20 Detected with good accuracy  Issue with some injections having a bad  2 »under investigation Merlino

6 GWDAW Smaller variations still present Non-stationarities: C6 Evolution in time of the frequency at which half of the SNR is integrated  Change in the shape of the PSD ± 10% variations on short time scales (~15 min)

7 GWDAW Non-stationarities: C7 l Variations of the PSD on short time scales not obvious to follow with adaptive mechanisms Same kind of variations observed in C7

8 GWDAW C6 analysis: quality cuts (I) C6 first six days  Horizon very unstable  “Bump” going up and down in Hz region of sensitivity curve (stray beam)  Leave this first part of the run aside Focus on remaining 8 days Dark fringe spectrum

9 GWDAW C6 analysis: quality cuts (II) Skip first five minutes after relock Use auxiliary channels to identify obvious sources of high SNR triggers, e.g.  Saturations in frequency stabilization loop  Glitches on actuator coil drivers

10 GWDAW C6 analysis: SNR distribution [ ] M  analysis  ~ 170 hours of data Very loud events eliminated by basic quality cuts Tail of distribution still extends to high values  Even strong, the hardware injections (in red) do not dominate the noise MBTA Inspiral injections Burst injections

11 GWDAW MBTA C7 analysis [ ] M  analysis  ~ 80 hours of data C7 SNR distribution slightly better than C6 Merlino A relatively quiet 10 hours long period

12 GWDAW C7 software injections Systematic studies (efficiency,  2 test) with Merlino on software injections performed during C7 quiet period  see poster by L.Bosi

13 GWDAW hardware injection noise event C6: a posteriori vetoes SNR distribution between low and high frequency bands   2 2 bands noise event Shawhan-Ochsner veto  Look at output of matched filter in time domain

14 GWDAW  2 2 bands < 100 Samples above threshold < 30  2 2 bands < 100 C6: SNR with vetoes Bulk of distribution unchanged High SNR tail definitely improved  Hardware injections almost stand out

15 GWDAW C7: vetoes Behavior similar to C6

16 GWDAW C7: SNR with vetoes Loudest surviving event has SNR < 20  2 2 bands < 40 Samples above threshold < 30  2 2 bands < 40

17 GWDAW Conclusion C6 and C7 data have extra-galactic sensitivity to neutron star inspirals Not science quality data  Detector behavior glitchy and not stationary Preliminary analysis  Two pipelines operational for online and offline analysis  Hardware injections, quality cuts, a posteriori vetoes Pursue investigations  Learn as much as we can from those data in order to get prepared for the science data to come next year


Download ppt "For the Collaboration GWDAW 2005 Status of inspiral search in C6 and C7 Virgo data Frédérique MARION."

Similar presentations


Ads by Google