The Catalan constant, G=Σ^∞_n=1[(−1)^k/(2n−1)²], has attracted much attention and has appeared in various contexts. It is the special value at s=2 of the Dirichlet L-function associated with the Gaussian field with its character odd. In this paper, we appeal to the Barnes G-function and a form of the functional equation for the Riemann zeta-function,to deduce an expression for the integral in t/sin t and one for G. These give rise to a corollary which reveals the intrinsicity of the Catalan constant G to the Barnes G-function. We also use one of Ramanujan's formulas to derive a theorem.