Big draw facing raise and reraise on flop: insta call or not?

No-Limit Hold'em, $1 BB (6 max, 6 handed)

saw flop/fold preflop
Hero ($95)
Button ($200)
SB ($100)
BB ($175)
UTG ($380)
MP ($115)

Preflop: Hero is CO with J[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/diamond.gif[/img].
UTG and MP call.
Hero call.
<font color="#666666"> Button folds</font>
<font color="#CC3333">SB raises to $4</font>
BB, UTG, MP and Hero call $3.

Flop: ($20) A[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">SB bets $5</font>
<font color="#666666"> BB folds</font>
UTG calls $5.
<font color="#CC3333">MP raises to $15</font>
Hero calls 15.
SB calls 10.
<font color="#CC3333">UTG raises to $100</font>
<font color="#666666"> MP folds</font>
Hero?
SB still to play after me.