Wang et al. present VASTER, the first short-timescale imaging and transient detection pipeline running in real time on a widefield radio telescope. VASTER has been running on ASKAP since July 2025, and images most of the ASKAP survey project data on timescales of 15 minutes. Results from the first two weeks of operation include the discovery of two long period transient (LPT) sources as well as other transient sources including AGN, pulsars and flare stars. The image above shows examples of typical false candidates in the VASTER outputs. Each column corresponds to one candidate: the top row shows the time-averaged deep images, and the bottom row shows the representative residual images. The white circle marks the candidate source position, with a radius of 20 arcsec. In the residual images, these candidates appear as non–PSF-like artefacts (where the PSF is the Point Spread Function, or the array response to a unresolved or point-like celestial radio source), which is a key indicator used to identify and reject false detections.