Process of beams from observatory to our pc

I want know which is the process from the observatory even we crunch the beams...

I have seen in the server status page appear the new series, when I saw it, I thought that LIGO had process the data before send the beams.

It´s true?

Can Anybody tell me the total size of BRP4 series?

BRP4 Will be able also for GPU?

I will stay grateful if anybody show me the complete process of travel and progamation of data including control points...

thanks in advance :)