We study the rough bilinear singular integral, introduced by Coifman and Meyer , $$ T_��(f,g)(x)=p.v. \! \int_{\mathbb R^{n}}\! \int_{\mathbb R^{n}}\! |(y,z)|^{-2n} ��((y,z)/|(y,z)|)f(x-y)g(x-z) dydz, $$ when $��$ is a function in $L^q(\mathbb S^{2n-1})$ with vanishing integral and $2\le q\le \infty$. When $q=\infty$ we obtain boundedness for $T_��$ from $L^{p_1}(\mathbb R^n)\times L^{p_2}(\mathbb R^n)$ to $ L^p(\mathbb R^n) $ when $1

23 pages