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We present results from three recent XMM-Newton observations of GX 339$-$4 inthe low/hard state, taken during the decay of a bright (peak $\sim 0.05$L$_{\rm Edd}$) failed outburst. Uniquely, these are the first XMM-NewtonEPIC-pn observations of this source using an imaging mode, which significantlyenhances the quality of the data at hand. In particular, thanks to the largeravailable bandpass, this allows an unprecedented constraint of the thermalaccretion disc component, and the level of photoelectric absorption. Wesimultaneously measured the inner radius of the accretion disc via thebroadened Fe K$\alpha$ line and the disc component. The two methods agree, andthe measured radii show good consistency over the three epochs. We find thatthe inner radius is at 20-30 $r_{\rm g}$, adding to the growing direct evidencefor truncation of the inner accretion disc in the low/hard state.

Simultaneous independent measurements of a truncated inner accretion disc in the low/hard state of GX 399$-$4