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We present Keck II laser guide star adaptive optics observations of the browndwarf WISEP J061135.13-041024.0 showing it is a binary with a componentseparation of 0.4". This system is one of the six known resolved binaries inwhich the magnitude differences between the components show a reversal in signbetween the Y/J band and the H/K bands. Deconvolution of the composite spectrumresults in a best fit binary solution with L9 and T1.5 components. We alsopresent a preliminary parallax placing the system at a distance of 21.2+/-1.3pc. Using the distance and resolved magnitudes we are able to place WISEPJ061135.13-041024.0AB on a color-absolute magnitude diagram, showing that thissystem contributes to the well-known "J-band bump" and the components'properties appear similar to other late-type L and early-type T dwarfs. Fittingour data to a set of cloudy atmosphere models suggests the system has an age >1Gyr with WISEP J061135.13-041024.0A having an effective temperature (Teff) of1275-1325 K and mass of 64-65 M_Jup, and WISEP J061135.13-041024.0B having Teff= 1075-1115 K and mass 40-65 M_Jup.

WISEP J061135.13-041024.0AB: A J-Band Flux Reversal Binary at the L/T Transition