Gamma-ray emission concurrent with the nova in the symbiotic binary V407 Cygni. - Abdo AA; Ackermann M; Ajello M; Atwood WB; Baldini L; Ballet J; Barbiellini G; Bastieri D; Bechtol K; Bellazzini R; Berenji B; Blandford RD; et al. (Science (New York, N.Y.), 2010)