Back to Quiescence: The Strange Case of the Transient Magnetar in Westerlund 1

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Supernovae, Supernova Remnants, Diffuse (Galactic) Emission And Isolated Neutron Stars, Cxo J164710.2-4

Scientific paper

On 2006 September 21, the candidate AXP CXOUJ1647 entered in an outburst phase. Since then XMM has monitored the decay of CXOUJ1647 allowing us to study its spectral and timing properties and their evolution. Until the latest observation, the timing and spectral parameters were evolving and smoothly approaching the 2006 pre-outburst values. However, the latest observation suggested that either the spectral model used for the quiescent emission is wrong or the 2006 bursting activity has modified the emission properties of CXOUJ1647. This proposal is aimed at completing the XMM monitoring of CXOUJ1647 and studying and comparing the spectral/timing parameters as it approaches to its (new) quiescent state with those of the previous quiescence state.

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