Prompt XMM-Newton and NuSTAR study of magnetar outbursts

The magnetar candidates (comprising AXPs and SGRS) are a small class of neutronstars mainly powered by their huge magnetic fields. They go through longstretches of quiescence, interrupted by periods of activity, via short Xraybursts, large giant flares and yearlytimescale Xray outbursts. Observationsperformed during, or immediately after such periods yield the largest amount ofinformation on magnetars. emission, allowing one to test the theoretical modelson a variety of phenomena and source states. We propose a Joint XMM (85ks) andNuSTAR (170ks) ToO program (1 trigger of 4 observations over a few months) aimedat gathering new physical insight on magnetars crust, field configuration,magnetospheres, and evolution. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]