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We present NuSTAR spectral and timing studies of the Supergiant Fast X-rayTransient (SFXT) IGR J17544-2619. The spectrum is well-described by a ~1 keVblackbody and a hard continuum component, as expected from an accreting X-raypulsar. We detect a cyclotron line at 17 keV, confirming that the compactobject in IGR J17544-2619 is indeed a neutron star. This is the firstmeasurement of the magnetic field in a SFXT. The inferred magnetic fieldstrength, B = (1.45 +/- 0.03) * 10^12 G * (1+z) is typical of neutron stars inX-ray binaries, and rules out a magnetar nature for the compact object. We donot find any significant pulsations in the source on time scales of 1-2000 s.

NuSTAR Detection Of A Cyclotron Line In The Supergiant Fast X-ray Transient IGR J17544-2619