  We present the first high time-resolution simultaneous X-ray, ultraviolet,
and optical observations of X-ray bursts in UY Vol, the optical counterpart of
the low mass X-ray binary EXO 0748-676, obtained with RXTE, HST, and Gemini-S.
Strong reprocessed signals are present in the ultraviolet (a factor of 4) and
optical (a factor of 2.5). These signals are lagged with respect to the X-rays
and appear significantly smeared as well. The addition of far-ultraviolet
coverage for one burst, together with the high quality of the dataset, allow
much tighter constraints upon the temperature and geometry of the reprocessing
region than previously possible. A single-zone black body reprocessing model
for this burst suggests a rise in temperatures during the burst from 18,000 to
35,000K and an emitting area comparable to that expected for the disk and/or
irradiated companion star. The lags, a mean of 4.0s and range of 2.5s, are
consistent with those expected within the binary. The single-zone black body
model cannot reproduce the ratio of optical to ultraviolet flux during the
burst, however. The discrepancy, corresponding to underpredicting the optical
by more than a factor of two, seems too large to explain with deviations from a
local black body spectrum and more likely indicates that a range of
reprocessing temperatures are required, as would be expected, with cooler
regions not contributing to the UV. Comparable results are derived from other
bursts, and in particular the lag and smearing both appear shorter when the
companion star is on the near side of the disk as predicted. The burst observed
by HST also yielded a spectrum of the reprocessed light. [Abridged]
