  The semisimple part of d-dimensional Galilean conformal algebra g^(d) is
given by h^(d)=O(2,1)+O(d), which after adding via semidirect sum the
3d-dimensional Abelian algebra t^(d) of translations, Galilean boosts and
constant accelerations completes the construction. We obtain Galilean
superconformal algebra G^(d) by firstly defining the semisimple superalgebra
H^(d) which supersymmetrizes h^(d), and further by considering the expansion of
H^(d) by tensorial and spinorial graded Abelian charges in order to
supersymmetrize the Abelian generators of t^(d). For d=3 the
supersymmetrization of h^(3) is linked with specific model of N=4 extended
superconformal mechanics, which is described by the superalgebra D(2,1;\alpha)
if \alpha=1. We shall present as well the alternative derivations of extended
Galilean superconformal algebras for d=1,2,3,4,5 by employing the Inonu-Wigner
contraction method.
