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

The effect of X-ray dust-scattering on a bright burst from the magnetar 1E 1547.0-5408