Deadtime corrections of luminosity in the ATLAS experiment

At the Large Hadron Collider near Geneva bunched beams of protons or lead ions are collided with unprecedented energies. The general purpose detector ATLAS is located at one of the four interaction points and is searching amongst others for new physics beyond the Standard Model. In order to measure cross sections for a given physics process, the knowledge of the precise integrated luminosity is essential. Due to readout limitations of the data acquisition system and detector hardware not all collisions can be recorded, that is, deadtime is introduced at the first level trigger. In this talk I present an overview of the different types of deadtime in ATLAS and how to measure it. I also present a technique for correcting the integrated luminosity of a physics analysis for deadtime, which accounts for bunch dependent effects of trigger deadtime and response.