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We have identified a merging galaxy cluster with evidence of two distinctsub-clusters. The X-ray and optical data suggest that the subclusters aremoving away from each other after closest approach. This cluster merger wasdiscovered from observations of the well localized short-duration gamma-rayburst (GRB), GRB 050509B. The Swift/Burst Alert Telescope (BAT) source positionis coincident with a cluster of galaxies ZwCl 1234.0+02916. The subsequentSwift/X-Ray Telescope (XRT) localization of the X-ray afterglow found the GRBcoincident with 2MASX J12361286+2858580, a giant red elliptical galaxy in thecluster. Deep multi-epoch optical images were obtained to constrain theevolution of the GRB afterglow, including a 27480s exposure in the F814W bandwith Hubble Space Telescope Advanced Camera for Surveys (ACS), among thedeepest imaging ever obtained towards a known galaxy cluster in a singlepassband. We perform a weak gravitational lensing analysis, including mappingthe total mass distribution of the merger system. Combined with Chandra X-rayObservatory and Swift/XRT observations, we investigate the dynamical state ofthe merger to probe the nature of the dark matter component. Our weakgravitational lensing measurements reveal a separation of the X-ray centroid ofthe western subcluster from the center of the mass and galaxy lightdistributions, similar to that of the famous "Bullet cluster". We conclude thatthe "Burst cluster" is another candidate merger system for determining thenature of dark matter and for studying the environment of short GRBs. Wediscuss connections between the cluster dynamical state and/or mattercomposition and compact object mergers, the leading model for the origin ofshort GRBs. Finally, we present results from a weak lensing survey based onarchival Very Large Telescope (VLT) images in the areas of 5 other short GRBs.

The Burst Cluster: Dark Matter in a Cluster Merger Associated with the Short Gamma Ray Burst, GRB 050509B