flyboyike - "31L", yes, thank you for the clarification!
Another 'feature' of the experience, (and those who have seen this phenomenal sight will recall), was the color of the exhaust - a slight 'greenish' tinge to the usual brown-black tint of turbojet exhaust; - it just added to that sense of the 'exotic' of what one was seeing and watching.
There wasn't a single part of our little airplane that wasn't 'in sympathy' with Concorde when the afterburners lit... the only thing I can imagine that takes one's breath as rapidly and involuntarily as that did, is the launch of a Saturn V, or the launch of the Shuttle, even from a distance.