2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/127206Recent observations of two nearby SN-less long-duration gamma-ray bursts (GRBs), which share no obvious characteristics in their prompt emission, suggest a new phenomenological type of massive stellar death. Here we briefly review the observational properties of these bursts and their proposed hosts, and discuss whether a new GRB classification scheme is needed.4 pages, 1 figure. Proceedings of the Amsterdam RTN (GRBs: an enigma and a tool) meeting, March 19-23, 2007. To appear in New Astronomy ReviewsAstrophysicstext