I was in grade 5 at the time. We didn't watch the launch in class, fortunately. I found out about it from a school crossing guard when I was walking home during my lunch break.
I was only 10 years old, but I remember all of the publicity for the teacher in space program prior to the launch, watching the explosion over and over again on TV, the search for debris afterwards, and President Reagan's address. It's hard to believe it has been 30 years.