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Status of resonant bar detectors E. Coccia for the IGEC2 Collaboration

GWDAW 12 - Boston, december 13 2007. Status of resonant bar detectors E. Coccia for the IGEC2 Collaboration. Status of the IGEC2 search for burst gravitational waves G.A.Prodi, G.Giordano, W.W.Johnson, S.Longo, V.Re, F.Salemi, G.Vedovato, M.Visco. Posters @ GWDAW 12.

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Status of resonant bar detectors E. Coccia for the IGEC2 Collaboration

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  1. GWDAW 12 - Boston, december 13 2007 Status of resonant bar detectorsE. Coccia for the IGEC2 Collaboration

  2. Status of the IGEC2 search for burst gravitational wavesG.A.Prodi, G.Giordano, W.W.Johnson, S.Longo, V.Re, F.Salemi, G.Vedovato, M.Visco Posters @ GWDAW 12 The Schenberg spherical gravitational wave detectorCesar Costa/Nadja Magalhaes

  3. Phys.Rev.D76 (2007) 102001 gr-qc 0705.0688

  4. IGEC2 observatory is continuing its search. • Ongoing analysis on Nov.2005 – Dec.2006: • fourfold coincidence 244 days (59%) • threefold coincidence 388 days (94 %).

  5. 95 % 98 % 79 % 81 % OPERATION TIME – NOV 16 2005 – DEC 31 2006 411 days • no detector 0 days • Single 0.98 days • Double 21.94 days • Triple144.10days • Quadruple 243.97 days

  6. IGEC 2 analysis procedure • We exchange candidate events lists and auxiliary information produced by each group using a search optimized for -like signals (the amplitude H [Hz-1] exchanged is the fourier component of h, gw strain). • Each group adds a “secret time shift” to the time of the candidate events • Cross check of the filter pipeline on a sample day of raw data. • The analysis is tuned so to allow the identification of the eventual candidates with very high confidence fixing the overall false alarm to 1 over 100 years (an upper limit, at the present sensitivity of the bar detectors, is not an interesting scientific result) • The tuning of the parameters (search thresholds, coincidence window and working periods) is fixed “a priori” by a blind analysis of the background characteristics • Finally, we will exchange the secret time shifts and searched for possible candidates • We will also select candidates with lower statistical significance to be used in possible future joint searches (IFO and/or Astroparticle detectors)

  7. AU-NA-EX-AL (4-fold period) # Events Vs Amplitude

  8. Cumulative Event Number Vs SNRAURIGA-NAUTILUS-EXPLORER-ALLEGRO

  9. Daily Event Rate DistributionsEXPLORER

  10. Daily Event Rate DistributionsNAUTILUS

  11. Daily Event Rate DistributionsALLEGRO

  12. Daily Event Rate DistributionsAURIGA

  13. AURIGA-EXPLORERCorrelogram

  14. AL_AU_EX shift=0.2s windows 60ms - 60ms - 40ms

  15. AL_AU_NA shift=0.2s windows 60ms - 60ms - 40ms

  16. AL_EX_NA shift=0.2s windows 60ms - 60ms - 40ms

  17. AU_EX_NA shift=0.2s windows 40ms - 40ms - 40ms

  18. AL_AU_EX_NA shift=0.2s windows AL-X 60ms - others 40ms

  19. Proposal for the final tuning of the analysis • ============================================================= • CONF             SNR CUTS       FA/Century     Time (day) • ============================================================= • AU-NA-EX       7/4.4/4.4                0.157                   249.39 • NA-EX-AL        5/5/5             0.129                    256.32 • AU-NA-AL        7/4.5/4.5               0.18                      311.40 • AU-EX-AL         7/4.5/4.5              0.155                    302.91 • ============================================================= • AU-NA-EX-AL     5/4/4/3               0.214                     243.96 •  ============================================================= •  TOT    0.835 FA/Century 388.14 days • ============================================================== We plan to finalize the analysis and open the box by the end of the year

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