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We search the archival Zwicky Transient Facility public survey for rapidlyevolving transient (RET) candidates based on well-defined criteria between 2018May and 2021 December. The search yielded 19 bona-fide RET candidates,corresponding to a discovery rate of $\sim 5.2$ events per year. Even with aGalactic latitude cut of $20^\circ$, 8 of the 19 events ($\sim 42$%) areGalactic, including one with a light-curve shape closely resembling that of theGW170817 kilonova (KN). An additional event is a nova in M31. Four out of the19 events ($\sim 21$%) are confirmed extragalactic RETs (one confirmed here forthe first time) and the origin of 6 additional events cannot be determined. Wedid not find any extragalactic events resembling the GW170817 KN, from which weobtain an upper limit on the volumetric rate of GW170817-like KNe of $R \le$2400 Gpc$^{-3}$ yr$^{-1}$ (95% confidence). These results can be used forquantifying contaminants to RET searches in transient alert streams,specifically when searching for kilonovae independently of gravitational-waveand gamma-ray-burst triggers.

Rapidly Evolving Transients in Archival ZTF Public Alerts