Swift-BAT results on the prompt emission of short bursts.
This is a brief review of short hard bursts (SHBs) from previous missions and from Swift-BAT; in particular, a review of the developing class of gamma-ray bursts which are similar to SHBs in that they have the short hard initial spike (0.1 to a few seconds), but that they also have a long extended phase of soft emission (50-200s). Further, we suggest that a class of events discovered by Horvath in the T90 versus hardness ratio plane is this SHB with extended emission.
Barthelmy
Scott D
SD
NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA. scott@milkyway.gsfc.nasa.gov