France.GEPAN / GEIPAN · CNES agency

In 1977, the director-general of CNES (Centre National d'Études Spatiales, the French space agency), Yves Sillard, authorized the creation of GEPAN —Groupe d'Étude des Phénomènes Aérospatiaux Non-identifiés—, based in Toulouse and directed by engineer Claude Poher. The idea was to treat the phenomenon as an object of scientific study within the state: receive reports —systematically channeled through the national gendarmerie and civil aviation, which guarantees a formal, traceable testimonial chain—, investigate them methodically, and archive and publish the results. It is something no other country has sustained over time: an official, public, permanent window within the national space agency, operating for nearly half a century across changes of government and cultural fashion.

The body changed name and scope over the years —it was reorganized as SEPRA (Service d'Expertise des Phénomènes de Rentrées Atmosphériques) in 1988, during much of the period led by Jean-Jacques Velasco, and adopted its current name, GEIPAN, in 2005— but kept its methodological core. Each case is classified into four categories according to how much can be explained and the quality of the available information: PAN A (perfectly identified), PAN B (probably identified), PAN C (not analyzable due to insufficient or poor-quality information) and PAN D (unidentified despite good-quality data), the last subdivided into D1 and D2 by degree of consistency. The statistics published by the body itself show that the vast majority of reports fall into A, B or C —on the order of a third each—, and only a small percentage, on the order of 2 to 3%, remains PAN D. Since 2007, GEIPAN has published its files online, a level of transparency unprecedented for a state body dedicated to the phenomenon.

Its reference work is the investigation of Trans-en-Provence (8 January 1981), considered one of the best-documented 'physical trace' cases in history. A resident, Renato Nicolaï, reported hearing a whistling sound and seeing a disc-shaped object briefly land on his property. Alerted immediately, the gendarmerie preserved the site, and GEPAN commissioned laboratory analyses of the soil and vegetation: the results indicated the ground had been compressed by a mechanical pressure on the order of several tons and heated to an estimated temperature between 300 and 600 °C, along with biochemical alterations in the nearby plants that were not trivially explained. The case is still debated —not even GEIPAN itself presents it as proof of exotic origin—, but it exemplifies the method: rapid collection, chain of custody, third-party analysis and publication. Beyond individual cases, the value of GEPAN/GEIPAN for the corpus is to be the proof of concept that a state can study the phenomenon seriously, without sensationalism or denial: most is explained, a minority resists, and everything is documented and available.

GEPAN/GEIPAN is, institutionally, the most important piece in the corpus: the world's oldest, most transparent and methodical official body dedicated to the phenomenon. Where other states swing between secrecy and denial —or between late declassification and silence—, France chose almost fifty years ago to study it openly from its space agency, classify every case by an explicit criterion and publish the files for public scrutiny. That combination of temporal continuity, the backing of a serious scientific agency and documentary transparency has no equivalent in any other country.

Its importance for this project is also methodological and almost genealogical. The PAN A–D system is a direct ancestor of the kind of calibration the corpus attempts: instead of the sterile 'extraterrestrial or nothing' dichotomy, it distributes cases along a spectrum of explainability, separates data quality from degree of strangeness, and leaves an unidentified residue explicit rather than sweeping it under the rug or exaggerating it. That this residue is small and stable —on the order of 2-3% over decades— is itself a first-order calibrating datum: it quantifies, from inside the state and with sustained method, how much of the phenomenon resists rigorous analysis. GEPAN/GEIPAN completes —and in a sense heads— the corpus's set of official offices (CRIDOVNI, OIFAA, CEFAA, CIAE), contributes the Trans-en-Provence physical-trace case as one of the most solid technical files available, and anchors in Europe the figure of Claude Poher, its founding director and a pioneer of the quantitative study of the phenomenon.