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The Suzaku data of the highly variable magnetar 1E 1547.0$-$5408, obtainedduring the 2009 January activity, were reanalyzed. The 2.07 s pulsation of the15--40 keV emission detected with the HXD was found to be phase modulated, witha period of $36.0^{+4.5}_{-2.5}$ ks and an amplitude of $0.52 \pm 0.14$ s. Themodulation waveform is suggested to be more square-wave like rather thansinusoidal. While the effect was confirmed with the 10--14 keV XIS data, themodulation amplitude decreased towards lower energies, becoming consistent with0 below 4 keV. After the case of 4U 0142+61, this makes the 2nd example of thiskind of behavior detected from magnetars. The effect can be interpreted as amanifestation of free precession of this magnetar, which is suggested to beoblately deformed under the presence of strong toroidal field of $\sim 10^{16}$G.

Discovery of a 36 ks Phase Modulation in the Hard X-ray Pulses from the Magnetar 1E 1547.0$-$5408