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 transient detections in the time-averaged deep images and short-timescale residual images, plotted from the VASTER outputs, for two sources: the flaring star ASKAP J051629.6−313543 (top row) and the LPT ASKAP J165130.3−450520 (bottom row). From left to right in each row: the time-averaged deep image, the residual image prior to the flare, the residual image during the flare, and the residual image after the flare. The white circle marks the target source position, with a radius of 20 arcsec. While the deep image contains multiple sources, these are effectively subtracted in the residual images; only the transient emission from the target source is visible during the flare.