The Cluster AgeS Experiment (CASE).<SUP>†</SUP> Detecting Aperiodic Photometric Variability with the Friends of Friends Algorithm

We adapt the friends of friends algorithm to the analysis of light curves, and show that it can be succesfully applied to searches for transient phenomena in large photometric databases. As a test case we search OGLE-III light curves for known dwarf novae. A single combination of control parameters allows us to narrow the search to 1% of the data while reaching a approximate to 90% detection efficiency. A search involving approximate to 2% of the data and three combinations of control parameters can be significantly more effective - in our case a 100% efficiency is reached.