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We analyze eleven NuSTAR and Swift observations of the black hole X-raybinary GX 339-4 in the hard state, six of which were taken during the end ofthe 2015 outburst, five during a failed outburst in 2013. These observationscover luminosities from 0.5%-5% of the Eddington luminosity. Implementing themost recent version of the reflection model relxillCp, we perform simultaneousspectral fits on both datasets to track the evolution of the properties in theaccretion disk including the inner edge radius, the ionization, and temperatureof the thermal emission. We also constrain the photon index and electrontemperature of the primary source (the "corona"). We find the disk becomes moretruncated when the luminosity decreases, and observe a maximum truncationradius of $37R_g$. We also explore a self-consistent model under the frameworkof coronal Comptonization, and find consistent results regarding the disktruncation in the 2015 data, providing a more physical preferred fit for the2013 observations.

The evolution of GX 339-4 in the low-hard state as seen by NuSTAR and Swift