I was co-opping at Fermilab. I'd just started up for the semester recently, maybe a week or two before. I worked on the 14th floor of the big tall A shaped building, where the electronics group had its main offices.

The lab has a cable TV system run throughout everywhere, normally used to broadcast various views of some of the experiments etc. I don't remember if they were covering it live (because of the whole "teacher in space" thing) or whether they simply switched to it after the disaster, but everyone had a TV to watch near their desk, and no one did much of anything else for the rest of the day. Everyone was depressed and upset about it.