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| term | definition | links | |
|---|---|---|---|
| ACD | (Anti-Coincidence Detector) The ACD is the collection of scintillating tiles that detect charged particles, and is crucial to background rejection. The ACD covers the tracker (the part of the LAT that converts gamma rays into electron-positron pairs and then tracks these pairs' trajectories). Charged particles will also register as signals in the tracker, so the ACD is used to determine if a signal is actually a charged particle and not a gamma ray. If an ACD tile has a "hit" (detects a charged particle) that lines up with a signal, then that fact is used to "veto" the signal (i.e., declare that it's not a gamma ray). | ||
| Acceptance | Defined as the effective area integrated over the solid angle (units: m^2 sr). | LAT performance page | |
| AGN (group) | (Active Galactic Nuclei) | AGN group page | |
| ARR | (Autonomous Repoint Request) | ||
| ATel | (Astronomer's Telegram) | ||
| ATS | |||
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