082359

Magnetars are a small class of neutron stars mainly powered by their huge magnetic fields. They go through long stretches of quiescence comma interrupted by periods of activity comma via large flares and yearly-timescale X-ray outbursts. Magnetar activity has been recently observed also in other pulsar classes. Observations performed during comma and immediately after such periods yield the largest amount of information on this magnetic emission comma allowing one to test the theoretical models on a variety of phenomena and source states. We propose a Joint XMM openPar85ksclosePar and NuSTAR openPar170ksclosePar ToO program openPar1 trigger of 4 observations over a few monthsclosePar aimed at gathering new physical insight on the crust and field configuration of sources showing magnetar outbursts.