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We describe  XMM–Newton  observations taken 4.3 d prior to and 1.5 d subsequent to two remarkable events that were detected with  Swift  on 2006 September 21 from the candidate magnetar CXOU J164710.2–455216: (i) a 20‐ms burst with an energy of 10 37  erg (15–150 keV), and (ii) a rapid spin‐down (glitch) with  Δ P / P ∼−10 −4  . We find that the luminosity of the pulsar increased by a factor of 100 in the interval between observations, from  1 × 10 33   to  1 × 10 35   erg s −1   (0.5–8.0 keV), and that its spectrum hardened. The pulsed count rate increased by a factor of 10 (0.5–8.0 keV), but the fractional rms amplitude of the pulses decreased from 65 to 11 per cent, and their profile changed from being single‐peaked to exhibiting three distinct peaks. Similar changes have been observed from other magnetars in response to outbursts, such as that of 1E 2259+586 in 2002 June. We suggest that a plastic deformation of the neutron star crust induced a very slight twist in the external magnetic field, which in turn generated currents in the magnetosphere that were the direct cause of the X‐ray outburst.

Exciting the magnetosphere of the magnetar CXOU J164710.2–455216 in Westerlund 1