Gravitational Wave Sources in A Time Varying Background

A unique challenge for LISA data analysis is that the noise backgrounds from instrumental noise and astrophysical sources will change significantly over both the year and the entire mission. The variation in the amplitude of the galactic stochastic GW background from galactic binaries as the antenna pattern rotates relative to the galactic center is a particularly significant component. LISA's sensitivity to different source classes will therefore vary as a function of sky location and time. The variation will impact both overall signal-to-noise and the efficiency of alerts to EM observers to search for multi-messenger counterparts. In this talk, I will discuss a wavelet-based technique for extracting sources from a time-varying background and discuss the impact on searches for various kinds of sources.