  We consider the Navier-Stokes system with Oseen and rotational terms
describing the stationary flow of a viscous incompressible fluid around a rigid
body moving at a constant velocity and rotating at a constant angular velocity.
In a previous paper, we prove a representation formula for weak solutions of
the system. Here the representation formula is used to get an asymptotic
expansion of respectively velocity and its gradient, and to establish pointwise
decay estimates of remainder terms. Our results are based on a fundamental
solution proposed by Guenther and Thomann J. Math. Fluid Mech., 8 (2006),
77-98. We thus present a different approach to this result, besides the one,
given by Kyed J. Math. Soc. Japan, 66 (2014), 1-16.
