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The null infinity limit of the gravitational energy-momentum and energy fluxdetermined by the covariant Hamiltonian quasi-local expressions is evaluatedusing the NP spin coefficients. The reference contribution is considered bythree different embedding approaches. All of them give the expected Bondienergy and energy flux.Comment: 14 pages, accepted by Phys.Rev.

Quasilocal energy-momentum and energy flux at null infinity