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The magnetar SGR J1745-2900 located in the vicinity of the supermassive blackhole Sgr A$^{\star}$ was detected during its X-ray outburst with the Swifht/XRTtelescope in April 2013. For several months after its detection the source wasobserved with the NuSTAR observatory, which allowed pulsations with a period$\sim3.76$ s to be recorded. Using these observations, we have studied indetail the dependence of the pulse profile and the pulsed fraction on theenergy and intensity of the magnetar. The pulsed fraction in the 3-5 and 5-10keV energy bands is shown to be 40-50%, slightly increasing with decreasingflux. We have performed phase-resolved spectroscopy for the source in theenergy band from 3 to $\sim$40 keV and show that the temperature of theemitting regions remains fairly stable during the pulse, while their apparentsize changes significantly with phase.

Phase-Resolved Spectroscopy of the Magnetar SGR J1745-2900 Based on Data from the NuSTAR Observatory