Baka wrote;
As Nereid likes to point out, we don't observe any 'jets' from SMBH or galaxy cores. In your GRB model, is all of the matter for each galaxy created all at once within the duration of the GRB (defining the 'initial conditions' of that galaxy)?...

Sorry...I meant to respond to this above...But, yes...that is it exactly!!! When the GRB
singularity explosion occurs, all the "Stuff" in that explosion is the after glow they see.
So, the 10, 20, 30 second duration GRB's will become the smaller dwarf galaxies and the 375 and 500 second duration GRB's will become the giant ellipticals.

Now, keep in mind that most of what the Big Bang says about nucleosynthesis (or it may be that one of the plazma theories is more accurate here), does start applying right here. The "Stuff" of the explosion must cool enough to become the Hydrogen, Helium, and Lithium and then be gathered back together by the black hole that was created to begin the star making process. I believe, it is somewhere in this process, where the Microwaves are created for the Cosmic Microwave Background, but not just one singularity created it...trillions of singularities created it one day at a time!

Thanks again

RussT