GRB Radiative Efficiencies Derived from the Swift Data: GRBs versus XRFs, Long versus Short

Bing Zhang, Enwei Liang, Kim L. Page, Dirk Grupe, Bin-Bin Zhang, Scott D. Barthelmy, David N. Burrows, Sergio Campana, Guido Chincarini, Neil Gehrels, Shiho Kobayashi, Peter Mészáros, Alberto Moretti, John A. Nousek, Paul T. O'Brien, Julian P. Osborne, Peter W.~A. Roming, Takanori Sakamoto, Patricia Schady, Richard Willingale