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We studied time variability and spectral evolution of the Galactic black holetransient Swift J174510.8-262411 during the first phase of its outburst.INTEGRAL and Swift observations collected from 2012 September 16 until October30 have been used. The total squared fractional rms values did not drop below5% and QPOs, when present, were type-C, indicating that the source never madethe transition to the soft-intermediate state. Even though the source was verybright (up to 1 Crab in hard X-rays), it showed a so called failed outburst asit never reached the soft state. XRT and IBIS broad band spectra, wellrepresented by a hybrid thermal/non-thermalComptonisationmodel, showed physicalparameters characteristic of the hard and intermediate states. In particular,the derived temperature of the geometrically thin disc black body was about 0.6keV at maximum.We found a clear decline of the optical depth of the coronaelectrons (close to values of 0.1), as well as of the total compactness ratiolh/ls. The hard-to-hard/intermediate state spectral transition is mainly drivenby the increase in the soft photon flux in the corona, rather than smallvariations of the electron heating. This, associated with the increasing of thedisc temperature, is consistent with a disc moving towards the compact objectscenario, i.e. the truncated-disc model. Moreover, this scenario is consistentwith the decreasing fractional squared rms and increasing of the noise and QPOfrequency. In our final group of observations, we found that the contributionfrom the non-thermal Comptonisation to the total power supplied to the plasmais 0.59+0.02/-0.05 and that the thermal electrons cool to kTe<26 keV.

Spectral and timing evolution of the bright failed outburst of the transient black hole Swift J174510.8-262411