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RX J0720.4−3125 is the most peculiar object among a group of seven isolated X‐ray pulsars (the so‐called Magnificent Seven), since it shows long‐term variations of its spectral and temporal properties on time‐scales of years. This behaviour was explained by different authors either by free precession (with a 7 or 14 yr period) or possibly a glitch that occurred around MJD = 528 66 ± 73 d.  We analysed our most recent  XMM–Newton  and  Chandra  observations in order to further monitor the behaviour of this neutron star. With the new data sets, the timing behaviour of RX J0720.4−3125 suggests a single (sudden) event (e.g. a glitch) rather than a cyclic pattern as expected by free precession. The spectral parameters changed significantly around the proposed glitch time, but more gradual variations occurred already before the (putative) event. Since MJD ≈ 530 00 d the spectra indicate a very slow cooling by ∼2 eV over 7 yr.

The continued spectral and temporal evolution of RX J0720.4−3125