GEIPAN · Trans-en-Provence (France, 1981)

The French space agency (CNES/GEIPAN) documented physical ground traces; one of the best-documented cases.

GEIPAN (an acronym in French for Groupe d'Études et d'Informations sur les Phénomènes Aérospatiaux Non-identifiés, or Unidentified Aerospace Phenomena Research and Information Group) () is a unit of the French space agency CNES based in Toulouse, whose mission is to investigate unidentified aerospace phenomena (UAP) and make its findings available to the public.