Demographics of the host galaxies of short-duration GRBs.  Unlike long GRBs, which occur exclusively in star-forming (late-type) galaxies, short GRBs have been found in both star-forming galaxies and ellipticals.  The relative ratio of late- to early- type of ~ 2:1 indicates some correlation with ongoing star-formation and a broad range of progenitor delay times (up to at least several Gyr).