Pulse period evolution during the 2016 burst of SMC X-3 based on the analysis of Swift/XRT data. The red line is based on the best-fit model describing the evolution of the spin (Townsend et al. 2017). The date of the XMM-Newton pointing is marked by the blue dashed vertical line. The spin period derived by the EPIC-pn data is marked with a blue circle. This solution coincides with the one derived from Swift/XRT on an observation performed within the same day.
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