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We report on the discovery by the Swift Gamma-Ray Burst Explorer of the blackhole candidate Swift J1539.2-6227 and the subsequent course of an outburstbeginning in November 2008 and lasting at least seven months. The source wasdiscovered during normal observations with the Swift Burst Alert Telescope(BAT) on 2008 November 25. An extended observing campaign with the Rossi X-RayTiming Explorer (RXTE) and Swift provided near-daily coverage over 176 days,giving us a good opportunity to track the evolution of spectral and timingparameters with fine temporal resolution through a series of spectral states.The source was first detected in a hard state during which strong low-frequencyquasi-periodic oscillations (QPOs) were detected. The QPOs persisted for about35 days and a signature of the transition from the hard to soft intermediatestates was seen in the timing data. The source entered a short-lived thermalstate about 40 days after the start of the outburst. There were variations inspectral hardness as the source flux declined and returned to a hard state atthe end of the outburst. The progression of spectral states and the nature ofthe timing features provide strong evidence that Swift J1539.2-6227 is acandidate black hole in a low-mass X-ray binary system.

Discovery and evolution of the new black hole candidate Swift J1539.2-6227 during its 2008 outburst