LAT IRFs: Effective Area

The LAT effective area is a function of an incident photon's energy E and inclination angle φ, and the event class. Note that the effective area does not take into account the deadtime, and therefore the observed count rate will be the effective area times the incident photon flux times the livetime fraction.

The following plots show the effective area for the source class. Note that 1 m² is 10⁴ cm².

On-Axis Effective Area

Effective Area as a Function of Angle, 10 GeV Photons