Ah yes, gamma ray bursts got less common because of changing star formation rates? Really interesting. I had missed the full argument. [Embarrassing :-)] The o

Ah yes, gamma ray bursts got less common because of changing star formation rates? Really interesting. I had missed the full argument. [Embarrassing :-)] The one I had seen was that closer to the galaxy centre there would be a higher frequency of supernovas per cubic light year, while too far out there would be too little of the heavier elements from supernovas.