The transient bursting Anomalous X-ray Pulsar in Westelund 1

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Supernovae, Supernova Remnants, Diffuse (Galactic) Emission And Isolated Neutron Stars, Cxo J164710.2-4, Xmm-Newton Proposal 05052901

Scientific paper

On 21st September 2006 an intense (10^40 erg/s) and short (20ms) burst was detected by the Swift BAT at a position consistent with that of the candidate anomalous X-ray Pulsar CXO J1647-4552, discovered by Chandra in 2005. Swift follow-up observations requested by our group began after only few hours from the event and found the source at a flux level of about 6x10^-11 erg/scm^2, more than 200 times brighter than the flux measured in 2005. Both the spectral and timing properties of CXO J1647-4552 are drastically different from those of the pre-burst observations. These findings proved unambiguously that CXO J1647-4552 is indeed an AXP. The present proposal is aimed at following the evolution of the main parameters of the second confirmed bursting transient AXP.

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