  A box in Euclidean $k$-space is the Cartesian product of $k$ closed intervals
on the real line. The boxicity of a graph $G$, denoted by $\text{box}(G)$, is
the minimum nonnegative integer $k$ such that $G$ can be isomorphic to the
intersection graph of a family of boxes in Euclidean $k$-space. In this paper,
we present a sufficient condition for a graph $G$ under which
$\text{box}(G)\leq \chi (G)$ holds, where $\chi (G)$ denotes the chromatic
number of $G$. Bhowmick and Chandran (2010) proved that $\text{box}(G)\leq \chi
(G)$ holds for a graph $G$ with no asteroidal triples. We prove that
$\text{box}(G)\leq \chi (G)$ holds for a graph $G$ in a special family of
circulant graphs with an asteroidal triple.
