  A bright burst, followed by an X-ray tail lasting ~10 ks, was detected during
an XMM-Newton observation of the magnetar 1E 1547.0-5408 carried out on 2009
February 3. The burst, also observed by SWIFT/BAT, had a spectrum well fit by
the sum of two blackbodies with temperatures of ~4 keV and 10 keV and a fluence
in the 0.3-150 keV energy range of ~1e-5 erg/cm2. The X-ray tail had a fluence
of ~4e-8 erg/cm2. Thanks to the knowledge of the distances and relative optical
depths of three dust clouds between us and 1E 1547.0-5408, we show that most of
the X-rays in the tail can be explained by dust scattering of the burst
emission, except for the first ~20-30 s. We point out that other X-ray tails
observed after strong magnetar bursts may contain a non-negligible contribution
due to dust scattering.
