NICER observation list: Target ID 365501

Magnetars are a small class of neutron stars believed to be powered by their huge magnetic fields. They go through long stretches of quiescence, interrupted by periods of activity in the form of short X-ray bursts, giant flares and yearly-timescale X-ray outbursts. Multi-band observations of these transient events yield the largest amount of information on magnetars emission, allowing to test the theoretical models on a variety of phenomena and source states. We propose a joint NICER (50 ks) and NuSTAR (110 ks) ToO program (1 trigger of 4 observations over a few months) aimed at gathering new physical insights on magnetars surface and crust, magnetic field configuration and magnetospheres.