studying the evolution of the photosphere and line velocities, we infer a roughly homologous structure, with the fastest optically-emitting material (the reprocessing layer) likely also responsible for the radio emission (which is analysed in detail in a forthcoming companion paper; K. D. Alexander et al., in preparation). This event suggests a closer connection between the optical and radio TDE outflows than has been appreciated to date, while a peak in the X-ray light curve and the detection of Bowen lines indicates that accretion began promptly in this event and likely drives the outflow. The rapid rise and decline of the light curve suggests that the properties of outflows may be key to understanding the fastest TDEs.

We detail the discovery and classification of AT2019qiz in section \[sec:class\], and describe our observations and data reduction in section \[sec:obs\]. We analyse the host galaxy, including evidence for a pre-existing AGN, in section \[sec:host\], and study the photometric and spectroscopic evolution of the TDE emission in sections \[sec:phot\] and \[sec:spec\]. This is then brought together into a coherent picture, discussed in section \[sec:dis\], before we conclude in section \[sec:conc\]. All data in this paper will be made publicly available via WISeREP [@Yaron2012].

Discovery 