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We analyze the very short Einstein timescale ($t_\rm E \simeq 7\,{\rm hr}$)event KMT-2019-BLG-2073. Making use of the pronounced finite-source effectsgenerated by the clump-giant source, we measure the Einstein radius $\theta_\rmE \simeq 4.8\,\rm \mu as$, and so infer a mass $M = 59\,M_\oplus(\pi_\rm{rel}/16 \,\rm \mu as)^{-1}$, where $\pi_\rm{rel}$ is the lens-sourcerelative parallax. We find no significant evidence for a host of this planetarymass object, though one could be present at sufficiently wide separation. Ifso, it would be detectable after about 10 years. This is the fourth isolatedmicrolens with a measured Einstein radius $\theta_\rm{E}<10\,\rm \mu as$, whichwe argue is a useful threshold for a "likely free-floating planet (FFP)"candidate. We outline a new approach to constructing a homogeneous sample ofgiant-star finite-source/point-lens (FSPL) events, within which the subsampleof FFP candidates can be statistically analyzed. We illustrate this approachusing 2019 KMTNet data and show that there is a large $\theta_\rm{E}$ gapbetween the two FFP candidates and the 11 other FSPL events. We argue that suchsharp features are more identifiable in a sample selected on $\theta_\rm{E}$compared to the traditional approach of identifying candidates based on short$t_\rm{E}$.

KMT-2019-BLG-2073: Fourth Free-Floating-Planet Candidate with $\theta_\rm E < 10 \rm\mu as$