We present a preliminary data release from our multi-year campaign at Keck Observatory to
study the host galaxies of a large sample of Swift-era gamma-ray bursts via multi-color
ground-based optical imaging and spectroscopy. With over 160 targets observed to date (and
almost 100 host detections, most of which have not previously been reported in the
literature) our effort represents the broadest GRB host survey to date. While targeting
was heterogeneous, our observations span the known diversity of GRBs including short
bursts, long bursts, spectrally soft GRBs (XRFs), ultra-energetic GRBs, X-ray faint GRBs,
dark GRBs, SN-GRBs, and other sub-classes. We also present a preview of our database
(currently available online via a convenient web interface) including a catalog of
multi-color photometry, redshifts and line ID’s. Final photometry and reduced imaging and
spectra will be available in the near future.