To any of you who think this is cool science and want to make sure more of it gets done: The GBT is under very severe threat of shutting down. In the recent NSF Portfolio Review, it was recommended that given the "current" funding situation (this was last year), the NSF divest itself of certain observatories including Green Bank. That means the telescope will shut down, unless a private consortium (i.e. of universities) can scrape together enough money to take it over.
Note also that the "current" funding situation referred to was even before the sequester, so the chances of getting the NSF to change their minds have dropped significantly - there is just not enough money in the budget. But please lobby your congressional representatives to restore funding for basic research if you think this is important!