Yes there was a sonic boom, a very gentle one, when SS1 reenters, but not on the way up. I was surprised the first time I saw it June 21st, but there is clearly a boom on reentry. It occurred just prior to it becoming visible again. I figure if you knew where to look precisely you could see it before that, but it is just not visible till it makes contact with the chase planes on the way down. You can see their con-trails, then SS1. Another interesting thing this time was that during it's circling down to the landing it happened to pass near Venus, which is visible in daylight if you know where to look, and several people around me said they saw it. Unfortunately I didn't see it at that time, but it was clearly visible earlier in the morning before sunrise.