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We present CARMA observations of a massive galaxy cluster discovered in theAMI blind SZ survey. Without knowledge of the cluster redshift a Bayesiananalysis of the AMI, CARMA and joint AMI & CARMA uv-data is used to quantifythe detection significance and parameterise both the physical and observationalproperties of the cluster whilst accounting for the statistics of primary CMBanisotropies, receiver noise and radio sources. The joint analysis of the AMI &CARMA uv-data was performed with two parametric physical cluster models: the{\beta}-model; and the model described in Olamaie et al. 2012 with the pressureprofile fixed according to Arnaud et al. 2010. The cluster mass derived fromthese different models is comparable but our Bayesian evidences indicate apreference for the {\beta}-profile which we, therefore, use throughout ouranalysis. From the CARMA data alone we obtain a Bayesian probability ofdetection ratio of 12.8:1 when assuming that a cluster exists within our searcharea; alternatively assuming that Jenkins et al. 2001 accurately predicts thenumber of clusters as a function of mass and redshift, the Bayesian probabilityof detection is 0.29:1. From the analysis of the AMI or AMI & CARMA data theprobability of detection ratio exceeds 4.5x10^3:1. Performing a joint analysisof the AMI & CARMA data with a physical cluster model we derive the total massinternal to r200 as MT,200 = 4.1x10^14Msun. Using a phenomenological{\beta}-model to quantify the temperature decrement as a function of angulardistance we find a central SZ temperature decrement of 170{\mu}K in the AMI &CARMA data. The SZ decrement in the CARMA data is weaker than expected and wespeculate that this is a consequence of the cluster morphology. In aforthcoming study we will assess the impact of cluster morphology on the SZdecrements that are observed with interferometers such as AMI and CARMA.

A joint analysis of AMI and CARMA observations of the recently discovered SZ galaxy cluster system AMI-CL J0300+2613