Gamma-ray bursts afterglows with energy injection from a spinning down neutron star S. Dall’Osso, G. Stratta, D. Guetta, S. Covino, G. De Cesare and L. Stella A&A, 526 (2011) A121 Published online: 10 January 2011 DOI: 10.1051/0004-6361/201014168