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X-RAY, OPTICAL AND INFRARED OBSERVATIONS OF GX 339-4 IN 2011 DECAY

We report multiwavelength observations of the black hole transient GX 339-4 during its outburst decay in 2011 using the data from RXTE, Swift and SMARTS. Based on the X-ray spectral, temporal, and the optical/infrared (OIR) properties, the source evolved from intermediate to low/hard state. Twelve days after the transition to the low/hard state, a rebrightening was observed simultaneously in the optical and the infrared bands. SEDs of the excess OIR emission from the start of the brightening, and close to the peak of the brightening yield a at spectral slope. The analysis of the SEDs from the OIR rebrightening in the hard state results in a at spectrum for the excess emission above the baseline. Assuming that the excess is from a compact jet, we discuss the possible locations of the spectral break that mark the transition from optically thick to optically thin synchrotron components. Only during the rising part of the rebrightening, we detected uctuations with the binary period of the system. We discuss a scenario that includes irradiation of the disk in the intermediate state, irradiation of the secondary star during OIR rise and jet emission dominating during the peak to explain the entire evolution of the OIR light curve. Subject headings: black hole physics | ISM: jets and outows | X-rays: binaries