Prompt X-ray and radio follow-up of magnetar outbursts

Magnetars are neutron stars mainly powered by their huge magnetic fields. Theygo through long stretches of quiescence, interrupted by periods of activity, via short Xray bursts, large giant flares and yearlytimescale Xray outbursts.Lately several normal pulsars showed magnetarlike emission, and FRBlike eventswere observed during a short Xray burst, prompting important questions on theexact physics and reach of the magnetar phenomenon. We propose a Joint XMM (110ks) and NRAO/GRB (14hr) ToO program aimed at gather new physical insights onmagnetars surface, field configuration and magnetosphere; search for radiopulsed emission and for (quasi)simultaneous Xray and radio bursts. We mighttrigger this program on any source that will undergo a magnetarlike outburst during AO21. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]