Great to see a discussion going on...just what I hoped would happen!

Anyway, I seem to recall seeing a histogram of the lenght of grbs. If I remember correctly, there were two peaks corresponding to short grbs (~1 sec) and long grbs (~30 sec to 1 mind) and the speculation was that different mechanisms may be responsible for each. I will see if I can find a reference on that, or if our resident GRB expert, Dr. Don, cares to comment [img]/phpBB/images/smiles/icon_smile.gif[/img]

Rob