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The magnetar 1E~1547$-$5408 recently exhibited two periods of outburst,beginning on 2008 October 3 and 2009 January 22. Here we present an analysis ofthe persistent radiative evolution and a statistical study of the burstproperties during the 2009 outburst using the {\em Swift} X-ray Telescope(XRT). We find that the 1--10 keV flux increased by a factor of $\sim500$ andhardened significantly, peaking $\sim6$ hours after the onset of the outburst.The observed pulsed fraction exhibited an anti-correlation with phase-averagedflux. Properties of the several hundred X-ray bursts during the 2009 outburstwere determined and compared to those from other magnetar outburst events. Wefind that the peaks of the bursts occur randomly in phase but that the foldedcounts that compose the bursts exhibit a pulse which is misaligned with thepersistent pulse phase. We also report a correlation between burst hardness andflux. We compare the hardness-flux evolution of the persistent emission of bothoutbursts to those from other magnetars and find that although there does existan overall trend, the degree of hardening for a given increase in flux is notuniform from source to source. These results are discussed in the context ofprevious results and within the magnetar model.

The 2009 outburst of magnetar 1E 1547-5408: Persistent radiative and burst properties