Distributions of X-ray fluxes, distance estimates, and derived luminosities for STONKS alert sources. Panel a: comparison of flux distributions for sources with distance estimates (red), and without (blue). Panel b: distance estimates for the 35 sources where one is available. Panel c: distribution of distances and X-ray luminosities for these 35 sources. In panel a, we also display the 10 ks sensitivity limits for source detection in some other X-ray transient detectors.