"...the rock in question was just six feet (two metres) across..."
So there's no lower limit in size to make the news?
OMG!! There's a small pebble burning up in the atmosphere, with no advanced warning.
OMG!! There's a small rock, that we just detected 26 seconds before impact.
OMG!! There's our present 2m rock that we detected only hours before.
OMG!! There's a 10m rock that we detected only days before.
Shall we plot a graph of asteroid size versus typical detection range?