Thanks for further clarification Everard
Bear in mind most meteors, even fireballs, are individually rarely seen further than a 250klm radius from dead centre under them. They rarely get lower than 90 - 70klm from the earths surface visually, think of the curvature of the earth, (after that, if they have survived the entry, they literally drop like stones as by then, normally, they have been slowed to normal terminal velocity, as per earths gravity, and are no longer ablating brightly)
This monster was seen at points almost 1000 klm apart!
equivalent of as seen from one end of Britian to the other!
reminds me of the biggy in '86 that was also seen from adelaide to melbourne, and actually made it to ground
pretty rare to be seen so far afield.