GWOLLUM's friend: G2G
G2G stands for Glitch-to-Glitch. This algorithm was designed to isolate and characterize correlations between two trigger samples. Index: |
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The G2G algorithm must be given two trigger samples: the source trigger sample and the target trigger sample. The triggers are first clustered in time. Then a time coincidence operation is performed between the two cluster samples: a coinc event is defined as the time overlap between a source cluster and a target cluster. Three fundamental variables are measured:
From these variables, one derives:
The source and target channels are strongly coupled if both of these variables take high values (close to 100%). However, having high values of the use-time percentage is sufficient to claim a glitch-to-glitch coupling: source → target. In that case, the source channel is said to be a reliable "witness" channel. The time efficiency variable is then used to measures how much the target channels is affected by the noise to which the source channel is sensitive. The picture below represents how the G2G variables are computed. ![]() |
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