Same thing! Got a TEXT message to my phone saying I won $1000.- Target giftcard and it has to be claimed in 24 hours....
The web-site they ask me to check out is www.targetwinners.com
But I did not entry Target for quite long time~
I got a text message in the midle of the night that said I won a price of $1000 and that I have to claim it within 24 hours contact http://TargetContest.com/
it smels fishi, it is a scam all the way