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We report the discovery of a high-energy transient with the IBIS/ISGRIdetector on board the INTEGRAL observatory. The source, namely IGR J00291+5934,was first detected on 2nd December 2004 in the routine monitoring of theIBIS/ISGRI 20--60 keV images. The observations were conducted during GalacticPlane Scans, which are a key part of the INTEGRAL Core Programme observations.After verifying the basic source behaviour, the discovery was announced on 3rdDecember. The transient shows a hard Comptonised spectrum, with peak energyrelease at about 20 keV and a total luminosity of ~ 0.9E36 erg/s in the 5--100keV range, assuming a distance of 3 kpc. Following the INTEGRAL announcement ofthe discovery of IGR J00291+5934, a number of observations were made by otherinstruments. We summarise the results of those observations and, together withthe INTEGRAL data, identifiy IGR J00291+5934 as the 6th member of a class ofaccreting X-ray millisecond pulsars.Comment: Accepted for publication as an A&A Letter 24/01/2005. 5 pages, 2  figure

Discovery of theINTEGRALX/γ-ray transient IGR J00291+5934: A Comptonised accreting ms pulsar?