Plots of typical uncertainty region sizes for the Omega (top) and unconstrained cWB (bottom) pipelines, as a function of GW strain amplitude at Earth, for various waveform types. The “searched area” is the area of the skymap with a likelihood value greater than the likelihood value at the true source location before the galaxy catalog is used to further limit the search region. The solid line with symbols represents the median (50%) performance, while the upper and lower dashed lines show the 75% and 25% quartile values. Near the detection threshold (h_rss ~ 10^-21 Hz^−1/2) , uncertainty regions are typically between 10 and 100 square degrees. The Omega pipeline performs poorly on white noise bursts but exceptionally well on sine-Gaussians because it is designed to identify signals that are well-localized in frequency space.