Evidence for a proto-black hole and a double astrophysical component in GRB 101023 A. V. Penacchioni, R. Ruffini, L. Izzo, M. Muccino, C. L. Bianco, L. Caito, B. Patricelli and L. Amati A&A, 538 (2012) A58 Published online: 01 February 2012 DOI: 10.1051/0004-6361/201118403