GEIPAN (sept. 2005-), formerly known as GEPAN (1977-1988) and SEPRA (1988-2004), is a unit of the French Space Agency CNES whose brief is to investigate unidentified aerospace phenomena (UAP) and make its findings available to the public.
The French Gendarmerie was instructed to channel data from reports of UFO sightings to SEPRA, which therefore was in a position to draw on a large database of such events. In cases where physical traces appeared to be present, SEPRA could call on the technical resources of CNES to perform a thorough scientific investigation. A famous example of such an investigation was in the Trans-en-Provence Case.
In March 2007, GEIPAN started to make its archives available online to everyone.
French skeptics have criticized the quality of the work of the GEPAN.