  We have conducted an extensive observational campaign of SWIFT J1753.5-0127
during June 2007 after its bright outburst episode in 2005. We have performed
multi-band optical photometry, optical spectroscopy, X-ray spectroscopy and
timing and ULTRACAM optical photometry simultaneously in three bands. Both the
optical spectrum and the X-ray spectrum, along with enhanced brightness in
broad-band photometry point to recent increased activity. We analyze the
different spectral regions, finding a smooth optical continuum with a
remarkable lack of lines and a very blue component modulated with a period of
3.2hr and a hard power-law X-ray spectrum. Both the X-ray and optical power
spectra are flat at low frequencies up to the 0.1 Hz (10 s) range, then
decreasing roughly as a power law consistent with flickering. Furthermore, the
optical data show quasi-periodic oscillations (QPOs) near 0.08 Hz (13 s).
Together with a dynamical and auto-correlation analysis of the light curves we
attempt to construct a complete physical picture of this intriguing system.
