  A sophisticated trigger system, capable of real-time track reconstruction, is
used in the ATLAS experiment to select interesting events in the proton-proton
collisions at the Large Hadron Collider at CERN. A set of $b$-jet triggers was
activated in ATLAS for the entire 2011 data-taking campaign and successfully
selected events enriched in jets arising from heavy-flavour quarks. Such
triggers were demonstrated to be crucial for the selection of events with no
lepton signature and a large jet multiplicity. An overview of the track
reconstruction and online $b$-jet selection with performance estimates from
data is presented in these proceedings.
