An optical counterpart to GRB 971227? A. Guarnieri, A. J. Castro-Tirado, C. Bartolini, M. Lolli, N. Masetti, A. Piccioni, F. Zavatti, J. Gorosabel, Y. Aguilar, R. Kohley et al. (15 more) Astron. Astrophys. Suppl. Ser., 138 3 (1999) 457-458 Published online: 15 September 1999 DOI: 10.1051/aas:1999307