  We observed asteroid (596) Scheila and its ejecta cloud using the Swift
UV-optical telescope. We obtained photometry of the nucleus and the ejecta, and
for the first time measured the asteroid's reflection spectrum between 290 -
500 nm. Our measurements indicate significant reddening at UV wavelengths (13%
per 1000 {\AA}) and a possible broad, unidentified absorption feature around
380 nm. Our measurements indicate that the outburst has not permanently
increased the asteroid's brightness. We did not detect any of the gases that
are typically associated with either hypervolatile activity thought responsible
for cometary outbursts (CO+, CO2+), or for any volatiles excavated with the
dust (OH, NH, CN, C2, C3). We estimate that 6 x 10^8 kg of dust was released
with a high ejection velocity of 57 m/s (assuming 1 {\mu}m sized particles).
While the asteroid is red in color and the ejecta have the same color as the
Sun, we suggest that the dust does not contain any ice. Based on our
observations, we conclude that (596) Scheila was most likely impacted by
another main belt asteroid less than 100 meters in diameter.
