  In this paper we report on the observations performed with INTEGRAL and Swift
of the first outburst detected from the hard X-ray transient MAXI J1828-249.
During the first about two days of the outburst, the source was observed by
MAXI to undergo a very rapid transition from a hard to a softer spectral state.
While the hard state was not efficiently monitored because the transition
occurred so rapidly, the evolution of the source outburst in the softer state
was covered quasi-simultaneously in a broad energy range (0.6-150 keV) by the
instruments on-board INTEGRAL and Swift. During these observations, the spectra
measured from the source displayed both a prominent thermal emission with
temperature kT 0.7 keV and a power-law hard component with a photon index gamma
2.2 extending to 200 keV. The properties of the source in the X-ray domain are
reminiscent of those displayed by black hole transients during the soft
intermediate state, which supports the association of MAXI J1828-249 with this
class of objects.
