Astronomers probe mystery of short GRBs | The Register

Astronomers have for the first time observed the visible afterglow of an
elusive short-lived gamma ray burst (GRB).

Long-lived bursts have been seen in the optical spectrum before, but the
short bursts are so short that no telescope has ever been able to respond to
one quickly enough to catch it in the act. By definition, the short bursts
last less than two seconds, but they are often far shorter.

More from http://www.theregister.co.uk/2005/10/07/short_grbs/
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