Astrophysicist: Gamma ray bursts (GRBs) -- explosions of powerful radiation from deep space -- have traditionally been classified as either short or long,  terms that reflect the explosion' s relative duration  However, an unusual GRB has been sighted  Its duration was long, but in every other respect it had the properties of a short GRB
Clearly, the descriptive labels short and long have now outlived their usefulness
No other GRBs with unusual properties have been sighted.