SOUSA: the Swift Optical/Ultraviolet Supernova Archive
  The Ultra-Violet Optical Telescope on the Swift spacecraft has observed
hundreds of supernovae, covering all major types and most subtypes. Here we
introduce the Swift Optical/Ultraviolet Supernova Archive (SOUSA), which will
contain all of the supernova images and photometry. We describe the observation
and reduction procedures and how they impact the final data. We show photometry
from well-observed examples of most supernova classes, whose absolute
magnitudes and colors may be used to infer supernova types in the absence of a
spectrum. A full understanding of the variety within classes and a robust
photometric separation of the groups requires a larger sample, which will be
provided by the final archive. The data from the existing Swift supernovae are
also useful for planning future observations with Swift as well as future UV
observatories.
