During its 2024 outburst the 448 Hz pulsar spun up at 3.15e-13 Hz/s until MJD 60377, then its pulse phase swung, and burst-time pulse profiles lagged persistent profiles by an amount decreasing with X-ray energy.
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Timing and spectral studies of SRGA J144459.2$-$604207 with NICER, Einstein Probe, IXPE, NuSTAR, Insight-HXMT and INTEGRAL during its 2024 outburst
During its 2024 outburst the 448 Hz pulsar spun up at 3.15e-13 Hz/s until MJD 60377, then its pulse phase swung, and burst-time pulse profiles lagged persistent profiles by an amount decreasing with X-ray energy.