Help on a checkraise gone bad $11

[mgs29035]

I originally checked with the intention of check raising. Now I'm not so sure I have them both beat, I think SB might have a set. Is that too weak tight?

Ultimate Bet No-Limit Hold'em Tourney, Big Blind is t60 (7 handed) converter

Hero (t2605)
UTG (t2180)
MP1 (t2395)
MP2 (t2560)
CO (t2090)
Button (t320)
SB (t2850)

Preflop: Hero is BB with Q[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">UTG raises to t120</font>, <font color="#666666">4 folds</font>, SB calls t90, Hero calls t60.

Flop: (t360) 6[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, Hero checks, <font color="#CC3333">UTG bets t115</font>, <font color="#CC3333">SB raises to t705</font>, Hero ??