The sharpness of gamma-ray burst prompt emission spectra Hoi-Fung Yu, Hendrik J. van Eerten, Jochen Greiner, Re’em Sari, P. Narayana Bhat, Andreas von Kienlin, William S. Paciesas and Robert D. Preece A&A, 583 (2015) A129 Published online: 04 November 2015 DOI: 10.1051/0004-6361/201527015