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Magnetar-like activity has been observed in a large variety of neutron stars.PSR J1846-0258 is a young 327 ms radio-quiet pulsar with a large rotationalpower ($\sim 8 \times 10^{36}$ erg s$^{-1}$), and resides at the center of thesupernova remnant Kes 75. It is one of the rare examples of a high magneticfield pulsar showing characteristics both of magnetars and radio pulsars, andcan thus provide important clues on the differences in the emission mechanismsbetween these two classes. In 2006, PSR J1846-0258 was detected to undergo anoutburst for the first time, accompanied by a large flux increase, millisecondX-ray bursts, significant spectral changes and a large timing glitch. On August1st 2020, after nineteen years of quiescent stable emission, the sourceunderwent a second magnetar-like outburst, which was followed up with severalobservations by NICER, XMM-Newton, NuSTAR and Swift. In this work, we report onthe long-term timing and X-ray spectral properties of the source following the2020 outburst, and place upper limits on any radio activity. We demonstratethat the pulsed flux increased by a factor $> 6$ during the outburst, followedby non-trivial variability in the spin-down rate. Our timing analysis showsthat the spin frequency and its derivative are clearly affected bymagnetospheric activity due to the outburst. We find hints for an oscillationin the frequency derivative with a timescale of 50-60 days, recovering later onto stable quiescence.

Long-term study of the 2020 magnetar-like outburst of the young pulsar PSRJ1846-0258 in Kes 75