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Veto Analysis Marina Del Prete Corso di Dottorato dell’ Universita’ di Siena

Dark Fringe. Seismometer. It is a gravewave?. Or did something locally create this ?. Veto Analysis Marina Del Prete Corso di Dottorato dell’ Universita’ di Siena. We search for a transient like signal or burst event which could be a signal from a supernova event

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Veto Analysis Marina Del Prete Corso di Dottorato dell’ Universita’ di Siena

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  1. Dark Fringe Seismometer It is a gravewave? Or did something locally create this? Veto Analysis Marina Del Prete Corso di Dottorato dell’ Universita’ di Siena

  2. We search for a transient like signal or burst event • which could be a signal from a supernova event • A burst waveform is not well known and • there are many kind of techniques to search • for “generic” burst signals. We have to face the problem of noise in the experimental apparatus which can mimic a GW signal. We have a Dark Fringe signal (where we expect to observe the event of supernova), and many environmental monitoring and auxiliary channels It can be convenient to apply a veto analysis

  3. I have a peak in Dark Fringe and in the enviromental channel. I have only a peak in Dark Fringe • Set a threshold on the event SNR for the Dark Fringe (SNR> 5) and the enviromental channels • The second step is to check at each time what happens within some interval Dt. Dark Fringe channel Enviromental channel It is a possible good event It is possible that the signal in the Dark Fringe is a glitch It can be appropriate to apply a Veto on the Signal in Dark Fringe

  4. How to decide if it is a good idea to apply a veto analysis on a specific channel? There are three fundamental parameters…… Nntv = # events above threshold and vetoed by noise channel Nnt= # events above threshold in the noise channel Use Percentage = 100 * ( Nntv/ Nnt) Nstv = # events above threshold and vetoed in Dark Fringe channel Nst = # events above threshold in the Dark Fringe channel Veto Efficiency = 100 * (Nstv/ Nst) Dt = time window of vetoed analysis Dtn= time interval between two peaks of noise channel < Dt Dead time = (Nnt * Dt – Dtn)/run time

  5. Dt = 0.6 sec Use perc = 90% Veto efficiency =0.65% Seism. at Beam Splitter Dt = 0.3 sec Seism. at ModeCleaner Use perc = 25% Veto efficiency =0.7% Dt = 0.6 sec Dt = 0.3 sec It is appropriate to apply a veto in a specific channel if we have a high value of use percentage (>50%) and a low value of the dead time (<1%) • High value of use percentage • and low value of dead time • It is appropriate to apply the veto • analysis to this channel • Low value of use percentage • It is not appropriate to apply • the veto analysis to this channel

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