we were traveling at high speed in enclosed car, so can't speak to any possible noise assoc with fireball; not sure what you mean by fragmentation - but I will say the trail was very wide and "fuzzy" relative to most other meteors I have seen; like this example of fireworks: http://susansternberg.files.wordpress.com/2012/05/7941-funky-fireworks.jpg?w=500&h=443 (no copyright infringement intended)
