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XTE J1818-245 is an X-ray nova that experienced an outburst in 2005, firstseen by the RXTE satellite. The source was observed simultaneously at variouswavelengths up to soft gamma-rays with the INTEGRAL satellite, from 2005February to September. X-ray novae are extreme systems that often harbor ablack hole, and are known to emit throughout the electromagnetic spectrum whenin outburst. We analyzed radio, (N)IR, optical, X-ray and soft gamma-rayobservations and constructed simultaneous broad-band X-ray spectra. Analyzingboth the light curves in various energy ranges and the hardness-intensitydiagram enabled us to study the long-term behavior of the source. Spectralparameters were typical of the Soft Intermediate States and the High SoftStates of a black hole candidate. The source showed relatively small spectralvariations in X-rays with considerable flux variation in radio. Spectralstudies showed that the accretion disc cooled down from 0.64 to 0.27 keV in 100days and that the total flux decreased while the relative flux of the hotmedium increased. Radio emission was detected several times, and,interestingly, five days after entering the HSS. Modeling the spectral energydistribution from the radio to the soft gamma-rays reveals that the radioflares arise from several ejection events. XTE J1818-245 is likely a black holecandidate transient source that might be closer than the Galactic Bulge. Theresults from the data analysis trace the physical changes that took place inthe system at a maximum bolometric luminosity of (0.4-0.9)e38 erg/s (assuming adistance between 2.8-4.3 kpc) and they are discussed within the context of discand jet models.

Detailed Radio to Soft Gamma-ray Studies of the 2005 Outburst of the New X-ray Transient XTE J1818-245