Analysis of the photometry data. The brightest pixel on the differential image (black line and dots, left axis) is compared with respect to a detection threshold (dashed magenta line). For an impact to be detected the brightest region of this curve must also verify that the location of the brightest pixel is nearly continuous (blue and orange line on the right axis). The impact is detected by the software in the region highlighted in yellow. Example is for the September 2012 impact.