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We use simultaneous Swift and RXTE observations of the black hole binary GX339-4 to measure the inner radius of its accretion disk in the hard state downto 0.4% L_{Edd} via modeling of the thermal disk emission and therelativistically broadened iron line. For the luminosity range covered in thiswork, our results rule out a significantly truncated disk at 100-1000 R_g aspredicted by the advection-dominated accretion flow paradigm. The measurementsdepend strongly on the assumed emission geometry, with most results providingno clear picture of radius evolution. If the inclination is constrained toroughly 20 degrees, however, the measurements based on the thermal diskemission suggest a mildly receding disk at a luminosity of 0.4% L_{Edd}. Theiron abundance varies between roughly 1-2 solar abundances, with the i=20degrees results indicating a negative correlation with luminosity, though thisis likely due to a change in disk illumination geometry.

Swift and RXTE observations of the black hole transient GX 339-4 in the hard state between outbursts