Berger, EdoPrice, Paul AntonyCenko, Stephen BGal-Yam, AvishaySoderberg, A MKasliwal, M MLeonard, D CCameron, P BFrail, Dale AKulkarni, Shrinivas RMurphy, D WKrzeminski, WPiran, TLee, B LRoth, K CMoon, D-SFox, Derek BHarrison, F APersson, S EPenprase, B ERich, JoshuaPeterson, BruceCowie, L L2015-12-132015-12-130028-0836http://hdl.handle.net/1885/80252Despite a rich phenomenology, γ-ray bursts (GRBs) are divided1 into two classes based on their duration and spectral hardness - the long-soft and the short-hard bursts. The discovery of afterglow emission from long GRBs was a watershed event, pinpointingKeywords: Galaxies; Jets; Optical collimators; Watersheds; Short-hard burst; Spectral hardness; Gamma rays; gamma ray radiation; article; cosmos; energy; environment; gamma radiation; infrared radiation; phenomenology; priority journal; radiation energy; X ray200510.1038/nature042382015-12-11