  Genuine-multipartite-entanglement (GME) concurrence is a measure of genuine
multipartite entanglement that generalizes the well-known notion of
concurrence. We define an observable for GME concurrence. The observable
permits us to avoid full state tomography and leads to different analytic lower
bounds. By means of explicit examples we show that entanglement criteria based
on the bounds have a better performance with respect to the known methods.
