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We present the spectral and timing analysis of X-ray observations performedon the Galactic black hole transient GRS 1716-249 during the 2016-2017outburst. The source was almost continuously observed with the Neil GehrelsSwift Observatory from December 2016 until October 2017. The X-ray hardnessratio and timing evolution indicate that the source approached the soft statethree times during the outburst, even though it never reached the canonicalsoft spectral state. Thus, GRS 1716-249 increases the number of black holetransients showing outbursts with "failed" state transition. During thesoftening events, XRT and BAT broadband spectral modeling, performed withthermal Comptonization plus a multicolor disc black-body, showed a photon index(Gamma < 2) and an inner disc temperature (kTin = 0.2-0.5 keV) characteristicof the hard intermediate state. This is in agreement with the root mean squareamplitude of the flux variability (rms > 10%). We find that, coherently with ascenario in which the disc moves closer to the compact object, the accretiondisc inner radius decreases with the increase of the inner disc temperature,until a certain point when the temperature starts to increase at constantradius. This, in addition with the spectral analysis results, suggests thateither the accretion disc reached the innermost stable circular orbit duringthe hard intermediate state or the hot accretion flow might re-condensate in aninner mini-disc. We report on the radio observations performed during theoutburst finding that GRS 1716-249 is located on the radio-quiet "outlier"branch of the radio/X-ray luminosity plane.

The long outburst of the black hole transient GRS 1716-249 observed in the X-ray and radio band