/ ciao4.15 / dictionary / grade.html
This page is for the old CIAO 4.15 release. Please see the CIAO home page for the latest release.
Grade (Event Grade)
The grade is a number assigned to every event based on which pixels in its 3x3 island are above their threshold value. The initial grade is assigned by on-board processing, which first finds local maxima, then analyzes the values of the surrounding 3x3 neighboring pixels. Based on this pattern, the event is assigned a grade. For example, a single-pixel event has a grade of 0. See the Event Grade section of the Proposers' Observatory Guide for more information.
/ ciao4.15 / dictionary / grade.html