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We present a detailed analysis of the spectral properties of the black holetransient GRS 1716-249, based on the archival Swift and NuSTAR observationstaken during the outburst of this source in 2016-2017. The first six NuSTARobservations show that the source is in a canonical hard state, where thespectrum is dominated by a power-law continuum. The seventh NuSTAR observationis taken during the intermediate state where both a disc thermal component anda power-law continuum are shown. All of our observations show a broad emissionline feature in the iron band and a Compton hump above 10 keV. We model thebroad band spectra using a high density disc reflection model, where the softX-ray emission in the hard state is interpreted as part of the disc reflectioncomponent. This model enables us to constrain the disc density parameter of GRS1716-249 in the range of $10^{19}$-$10^{20}$ cm$^{-3}$. We only obtain an upperlimit of the inner disc radius using high density disc reflection spectroscopyand the results indicate either a non-truncated disc or a slightly truncateddisc with $R_{\rm in}<20r_{\rm g}$.

A NuSTAR View of GRS 1716$-$249 in the Hard and Intermediate States