Results of the search for pulsations in the Swift /XRT data. The upper (middle) panel show the determined frequency (period) of pulsations from the source in each observation as a function of time. In the bottom panel we show the percentage of the total number of simulated lightcurves (100) for each observation that did not result in a statistically significant (≥ 3σ) detection of a spin period at the expected frequency. The reference time (t = 0) is 55 498.62225 MJD.