Answer based on context:

Hoping to rebound from their loss to the Colts, the Broncos traveled to Nashville to face the Tennessee Titans at LP Field. After a scoreless first quarter, the Broncos took the lead in the second quarter, as quarterback Kyle Orton threw a 2-yard touchdown pass to wide receiver Eddie Royal. The Titans responded, with quarterback Vince Young throwing an 8-yard touchdown pass to wide receiver Kenny Britt. The Broncos would retake the lead, with a 36-yard field goal by placekicker Matt Prater, but The Titans replied, when placekicker Rob Bironas nailed an incredible 55-yard field goal just before halftime. In the third quarter, the Broncos took the lead again, with another 36-yard field goal by Prater, but Titans' wide receiver Marc Mariani returned the ensuing kickoff 98 yards for a touchdown, putting Tennessee ahead 17-13. Tennessee's lead was narrowed, with a 35-yard field goal by Prater, but was increased again with a 46-yard field goal by Bironas. In the fourth quarter, the Broncos pulled ahead, when Orton completed a 6-yard touchdown pass to running back Correll Buckhalter. After the Titans fumbled the ensuing kickoff, the Broncos increased their lead with 28 seconds remaining, with a 36-yard field goal by Prater. The Broncos' defense thwarted the Titans' final desperation drive of the game.

How many field goals did Rob Bironas kick?
2