%method title>GW100916-HLV data release%method> <%method headline>GW100916-HLV data release%method> <%method cvsid>$Id: spectrograms.html,v 1.6 2011/06/03 01:42:16 ajw Exp $%method>
The figures below actually show "omegagrams" of the event. These are analogous to time-frequency spectrograms, except the basis set consists of sine-Gaussians rather than sine waves, with logarithmically-spaced central frequencies, and (in this case) quality factor Q = 22.6. The data are whitened and band-passed, and the plots are smoothed. For Gaussian noise in the absence of signal, these plots are typically all blue. The fact that the chirping signal power is clearly visible in the first two plots indicates that the signal is significantly larger than detection threshold, and these plots are qualitatively very similar to simulations with parameters close to the ones recovered in our search.