Katie is pictured responding to the announcement of her win as fans went wild.
The roof-rattling roar which greeted her victory over Britain's Natasha Jonas to secure at least a bronze medal was measured at 114 decibels. It was a whisper off a clap of thunder -- and a record for these Olympics.
But it was the lightning-fast reflexes of the 26-year-old Katie which electrified the packed crowd of predominantly Irish supporters who cheered her on.
Afterwards, Katie, who will fight Manzuna Chorieva of Tajikistan for silver tomorrow, said: "I knew the support was going to be good here but I didn't realise it was going to be so great."