The LISA Global Fit

The LISA space based gravitational wave observatory will open up the source-rich milli-Hertz band of the gravitational wave spectrum. The rich LISA data set will pose the unique challenge of having to disentangle thousands of overlapping signals, while also dealing with data gaps and non-stationary noise. To avoid bias, multiple signals and noise have to be fit simultaneously. I will describe the first prototype LISA Global Fit pipeline, which uses trans-dimensional Bayesian inference to simultaneously fit for thousands of compact galactic binaries, dozens of massive black hole mergers, and instrument noise.