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X-shooter is the first 2nd generation instrument of the ESO Very LargeTelescope(VLT). It is a very efficient, single-target, intermediate-resolutionspectrograph that was installed at the Cassegrain focus of UT2 in 2009. Theinstrument covers, in a single exposure, the spectral range from 300 to 2500nm. It is designed to maximize the sensitivity in this spectral range throughdichroic splitting in three arms with optimized optics, coatings, dispersiveelements and detectors. It operates at intermediate spectral resolution(R~4,000 - 17,000, depending on wavelength and slit width) with fixed echellespectral format (prism cross-dispersers) in the three arms. It includes a1.8"x4" Integral Field Unit as an alternative to the 11" long slits. Adedicated data reduction package delivers fully calibrated two-dimensional andextracted spectra over the full wavelength range. We describe the maincharacteristics of the instrument and present its performance as measuredduring commissioning, science verification and the first months of scienceoperations.

X-shooter, the new wide band intermediate resolution spectrograph at the ESO Very Large Telescope