No...only thing I do know was the EXXON shooting that invloved the State Trooper being at the scene at the time of the shooting...from what I could tell from news reports...it seems that the officer eluded to the shot coming over his head...and striking the victim in the back...
Other locations people mention a BOOM...can't tell if a BOOM were to be "echoing" in the back of a van or truck (maybe) or just plainly NOT usual urban noise that when heard surprises everyone.
Having fired weapons in urban environments I will suggest that to try and track a shot from sound is gonna be extreamly tough. The noise will reflect off structures to the point one is "positive" it came from that way when in fact..........yada yada yada.
If ya'll get anymore on this subject please ping me if ya get time.
Stay Safe !!