Similarities: GRB 940217, GBR 090926A and GRB 980923 J.R. Sacahui, M.M. González, N. Fraija, J.L. Ramirez and W.H. Lee EAS Publications Series, 61 (2013) 301-305 Published online: 22 July 2013 DOI: 10.1051/eas/1361048