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In this paper we report on the observations performed with INTEGRAL and Swiftof 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 byMAXI to undergo a very rapid transition from a hard to a softer spectral state.While the hard state was not efficiently monitored because the transitionoccurred so rapidly, the evolution of the source outburst in the softer statewas covered quasi-simultaneously in a broad energy range (0.6-150 keV) by theinstruments on-board INTEGRAL and Swift. During these observations, the spectrameasured from the source displayed both a prominent thermal emission withtemperature kT 0.7 keV and a power-law hard component with a photon index gamma2.2 extending to 200 keV. The properties of the source in the X-ray domain arereminiscent of those displayed by black hole transients during the softintermediate state, which supports the association of MAXI J1828-249 with thisclass of objects.

INTEGRAL and Swift observations of the hard X-ray transient MAXI J1828-249