It sounds like the final stage was unable to separate.
So now where did it come down?
While launch and separation of the rockets first stage went as planned, a clamshell-shaped fairing covering the satellite failed to open, meaning it was too heavy to reach orbit, Brunschwyler said on NASAs online television station.
As a direct result of carrying that extra weight, we could not reach orbit, Brunschwyler said. Indications are the satellite landed just short of Antarctica, in the ocean.