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We report on the temporal and spectral characteristics of the early X-rayemission from the Gamma Ray Burst 051117A as observed by Swift. The superbquality of the early X-ray light-curve and spectra of this source, one of thebrightest seen by the X-ray Telescope at such early times, allows anunprecedented look at the spectral and temporal evolution of the prompt andearly afterglow emission for this GRB and allows us to place stringent limitson the detection of lines. The X-ray light-curve at early times ischaracteristic of a shot-noise process, with individual shots well-modelled bya fast-rise and exponential decay spanning a broad range in rise-times anddecay rates. A temporal spectral analysis of the early light-curve shows thatthe photon index and source intensity are highly correlated with the spectrumbeing significantly harder when brighter, consistent with the movement of thepeak of the Band function to lower energies following individual flares. Thehigh quality spectrum obtained from the first orbit of WT mode data, enables usto place a 3 sigma upper limit on the strength of any emission line features ofEW < 15 eV, assuming a narrow emission-line of 100 eV at the peak of theeffective area (abridged).Comment: Accepted 15/3/2007 - To appear in A&

Swift multi-wavelength observations of the bright flaring burst GRB 051117A