  We study the energy levels of carriers confined in a magnetic quantum dot of
graphene surrounded by a infinite graphene sheet in the presence of energy gap.
The eigenspinors are derived for the valleys $K$ and $K'$, while the associated
energy levels are obtained by using the boundary condition at interface of the
quantum dot. We numerically investigate our results and show that the energy
levels exhibit the symmetric and antisymmetric behaviors under suitable
conditions of the physical parameters. We find that the radial probability can
be symmetric or antisymmeric according to the angular momentum is null or
no-null. Finally, we show that the application of an energy gap decreases the
electron density in the quantum dot, which indicates a temporary trapping of
electrons.
