Preliminary disturbance detection analysis for Gaia sources fainter than 13^th magnitude using extended AF windows

Within the Gaia astrometry field all stars with magnitudes fainter than 13 will have their 2-D readout windows binned to 1-D image shapes. For some readout windows there many be additional sources present in the window that remain undetected due to the window creation and binning process performed on-board the spacecraft. This technical note describes procedures and preliminary results into assessing the probability that an image shape for a star fainter than 13th magnitude contains an undetected secondary source