GEPAN, SEPRA, GEIPAN — the continuous French institutional UAP programme since 1977

France is institutionally distinctive among Western nations in operating a permanent, publicly named, government-housed UAP investigation programme that has functioned continuously since 1977. The programme has been renamed twice in its operational history — from GEPAN (1977–1988) to SEPRA (1988–2004) to GEIPAN (2005–present) — but its institutional location within the French national space agency CNES (Centre National d'Études Spatiales) and its core public-investigation function have remained constant across these reorganisations. Understanding this institutional continuity is essential to understanding why France produces the most accessible national UAP case archive currently in public release.

GEPAN: the founding period 1977–1988

GEPAN — Groupe d'Études des Phénomènes Aérospatiaux Non identifiés — was established within CNES in 1977 under the directorship of Yves Sillard, with operational scientific leadership from Claude Poher and subsequently Alain Esterle. The founding mandate was to provide a serious scientific investigation function for UAP reports received from French civil and military sources, drawing on CNES's scientific infrastructure and the cooperation of the French gendarmerie, which provides field-investigation support for the programme.

The early GEPAN period produced several of the most-cited individual French case investigations, including the Trans-en-Provence physical-trace case of 1981. The period also established the methodological framework — the systematic A/B/C/D case-classification scheme, the chain-of-custody discipline for physical evidence, the collaboration with national laboratories — that subsequent French institutional UAP investigation has continued to apply.

SEPRA: the interim period 1988–2004

GEPAN was renamed and reorganised in 1988 as SEPRA — Service d'Expertise des Phénomènes de Rentrées Atmosphériques. The renaming reflected a substantive shift in the unit's primary operational focus toward the institutional handling of space-debris atmospheric re-entry events, with UAP investigation continuing as a secondary function. The SEPRA period was institutionally leaner than the GEPAN period, with reduced resource allocation and reduced public-facing engagement.

Director Jean-Jacques Vélasco served as SEPRA director throughout most of this period and has subsequently spoken publicly about the case material and the institutional dynamics of the period. The SEPRA period is the most institutionally constrained phase in the continuous French programme's history, though it did continue to produce case-investigation output and to maintain the institutional infrastructure that the subsequent GEIPAN reorganisation built upon.

GEIPAN: the contemporary period 2005–present

GEIPAN — Groupe d'Études et d'Informations sur les Phénomènes Aérospatiaux Non identifiés — was established in 2005 as a substantive expansion and re-orientation of the SEPRA function. The contemporary GEIPAN has restored the unit's primary focus on UAP investigation and has substantially expanded the public-facing dimension of the programme. The most institutionally consequential feature of contemporary GEIPAN is the progressive public release of the accumulated case archive through the geipan.fr public website — a release programme that has, over the past two decades, made the French national UAP archive substantially more accessible than any other comparable national archive.

The continuity that matters

The institutional continuity across the three names is the substantive feature that distinguishes the French programme from the US, UK, and most other national equivalents. The French programme has accumulated nearly five decades of continuous case-investigation experience within a single institutional framework. The methodological discipline, the gendarmerie field-investigation infrastructure, and the public-archive release programme that contemporary GEIPAN operates collectively represent the longest-running and most institutionally stable national UAP function currently in operation.

For specific GEIPAN-investigated cases including Trans-en-Provence, Cussac, and Valensole, see the historical case index on the SkyLens UAP files page.

Editorial note: Independent SkyLens analysis of a French institutional UAP case or the GEPAN / SEPRA / GEIPAN investigative framework. The case index linking related releases is on the SkyLens UAP files page.