The late-outburst X-ray emission of the magnetar Swift J1818.0-1607

Swift J1818.01607 is a radioloud magnetar that went into outburst in 2020March. Its spin period of 1.36 s and its derivative imply a field strength of4e14 G, a very young age virgul500 years, and a spin down power of 1e36 erg/s, thelargest by far among all magnetars, rivaling those of rotationpowered pulsars(RPPs). Hence Swift J1818.01607 may represent the ultimate link between the twopopulations. The source has not reached quiescence yet. Hence, we propose alatetime monitoring campaign to establish its longterm decay trend, reveal thelatetime surface thermal pulse shape and pulsed fraction, and derive theradioXray pulse offset and compare it to the early stages of the outburst, allcrucial elements to place this unique source within the large family of magnetars and RPPs. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]