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The bright X-ray transient H 1743-322 was observed daily by the Rossi X-rayTiming Explorer (RXTE) during most of its 8-month outburst in 2003. We presenta detailed spectral analysis and a supporting timing analysis of all of thesedata, and we discuss the behavior and evolution of the source in terms of thethree principal X-ray states defined by Remillard and McClintock. These X-rayresults are complemented by Very Large Array (VLA) data obtained at sixfrequencies that provide quite complete coverage of the entire outburst cycleat 4.860 GHz and 8.460 GHz. We also present photometric data and finding chartsfor the optical counterpart in both outburst and quiescence. We closely compareH 1743-322 to the well-studied black-hole X-ray transient XTE J1550-564 andfind the behaviors of these systems to be very similar. As reported elsewhere,both H 1743-322 and XTE J1550-564 are relativistic jet sources and both exhibita pair of high-frequency QPO oscillations with a 3:2 frequency ratio. The manystriking similarities between these two sources argue strongly that H 1743-322is a black hole binary, although presently no dynamical data exist to supportthis conclusion.

The 2003 Outburst of the X-ray Transient H 1743-322: Comparisons with the Black Hole Microquasar XTE J1550-564