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Understanding the preferences of transient types for host galaxies withcertain characteristics is key to studies of transient physics and galaxyevolution, as well as to transient identification and classification in theLSST era. Here we describe a value-added database of extragalactictransients--supernovae, tidal disruption events, gamma-ray bursts, and otherrare events--and their host galaxy properties. Based on reported coordinates,redshifts, and host galaxies (if known) of events, we cross-identify their hostgalaxies or most likely host candidates in various value-added or surveycatalogs, and compile the existing photometric, spectroscopic, and derivedphysical properties of host galaxies in these catalogs. This new databasecovers photometric measurements from the far-ultraviolet to mid-infrared.Spectroscopic measurements and derived physical properties are also availablefor a smaller subset of hosts. For our 36333 unique events, we havecross-identified 13753 host galaxies using host names, plus 4480 using hostcoordinates. Besides those with known hosts, there are 18100 transients withnewly identified host candidates. This large database will allow explorationsof the connections of transients to their hosts, including a path towardtransient alert filtering and probabilistic classification based on hostproperties.

Linking Extragalactic Transients and their Host Galaxy Properties: Transient Sample, Multi-Wavelength Host Identification, and Database Construction