Within GEIPAN
Lessons from Notable GEIPAN UFO Case Files
Examines individual high-profile or illustrative GEIPAN cases to show classification in practice.
On this page
- 1983 Plouarzel Venus case
- 1985 Lyon meteoroid case
- 1990 Moosch laser/skytracer case
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Introduction
Individual case files are where GEIPAN’s classification system becomes most useful. Rather than treating UFO reports as a single undifferentiated category, GEIPAN investigates specific sightings, compares witness testimony with astronomical, atmospheric and human-made explanations, and then assigns a classification reflecting the strength of the evidence and the plausibility of the explanation. The public archive shows that a case can begin as a local mystery, attract media attention, and ultimately be resolved through systematic analysis. It also shows that classifications can be revisited when new information emerges. [Geipan]WikipediaGEIPANGEIPAN is clearly focused on UFO study, but UAP (PAN in French) is meant to cover a much broader area than UFO (OVNI in French)…
Three frequently cited examples—the 1983 Plouarzel sighting, the 1985 Lyon meteoroid observation, and the 1990 Moosch incident—illustrate different pathways to resolution. Together they demonstrate how GEIPAN distinguishes between astronomical misidentifications, rare natural events and initially puzzling observations that later receive conventional explanations.
1983 Plouarzel: When a UFO Wave Became an Astronomical Misidentification
The Plouarzel case from Brittany is one of the clearest examples of how a widely discussed UFO report can be reinterpreted through detailed reconstruction of viewing conditions. Witnesses reported unusual luminous objects over several evenings in March 1983, and local publicity amplified interest in the events. As often happens in UFO waves, later observers were influenced by reports already circulating in the press.
GEIPAN’s investigation examined witness locations, viewing directions and the positions of bright celestial objects at the relevant times. The analysis concluded that the principal observations corresponded to the planet Venus, while some later reports were consistent with observations of the bright star Arcturus. The case was ultimately classified as Category A, meaning the phenomenon was identified with confidence. [Geipan]cnes.fr7 Jul 2025 — GEIPAN, the French UAP research and information group created by CNES in 1977, collects, analyses and archives information o…
What makes Plouarzel important is not merely that it was explained. The file demonstrates several recurring features of UFO investigations:
- Bright astronomical objects can appear unusual when viewed under unfamiliar atmospheric conditions.
- Media coverage can increase the number of reports by drawing attention to ordinary celestial phenomena.
- Witness sincerity does not guarantee correct interpretation.
- Multiple reports of the same event do not necessarily imply an extraordinary cause.
The Plouarzel file is therefore a useful example of GEIPAN’s willingness to re-examine apparently mysterious events using astronomical data rather than relying solely on witness impressions. [Geipan]cnes.fr7 Jul 2025 — GEIPAN, the French UAP research and information group created by CNES in 1977, collects, analyses and archives information o…
1985 Lyon: A Classic Meteoroid Re-entry Mistaken for a UFO
On 3 September 1985, witnesses in Lyon and Villefranche-sur-Saône observed a rapidly moving luminous phenomenon crossing the sky. Some observers also reported unusual reflections and glows associated with the event, adding to its apparent mystery.
GEIPAN’s analysis found that the descriptions shared a set of characteristics commonly associated with a meteoroid or atmospheric re-entry event: very high apparent speed, a brief duration lasting only seconds, intense luminosity and a trajectory consistent across multiple witness accounts. Investigators concluded that the reports matched the expected appearance of a meteoroid entering the atmosphere and classified the case accordingly. [Geipan]cnes.fr7 Jul 2025 — GEIPAN, the French UAP research and information group created by CNES in 1977, collects, analyses and archives information o…
The Lyon case is particularly valuable because it shows how multiple independent witnesses can strengthen an explanation rather than strengthen a mystery. In this instance, consistency across observations helped investigators identify a natural phenomenon. Rather than creating a residual unexplained core, the convergence of testimony reinforced the meteoroid interpretation. [Geipan]cnes.fr7 Jul 2025 — GEIPAN, the French UAP research and information group created by CNES in 1977, collects, analyses and archives information o…
For readers exploring UFO databases, Lyon highlights an important principle: unusual events in the sky are not necessarily common events seen unusually. Sometimes they are genuinely rare phenomena—such as atmospheric entries—that many people have never observed before and therefore interpret as anomalous.
1990 Moosch: From Local Mystery to Skytracer Explanation
The Moosch case from Alsace is one of the more instructive examples of an initially puzzling observation that was ultimately assigned a probable conventional explanation.
On the evening of 19 September 1990, a family observed a milky-white oval form above a forested area near Moosch. The object reportedly executed movements and circular manoeuvres before disappearing. Subsequent neighbourhood enquiries uncovered additional witnesses who had observed similar luminous phenomena over several nights. At first glance, the reports appeared difficult to reconcile with a straightforward explanation. [Geipan]cnes.fr7 Jul 2025 — GEIPAN, the French UAP research and information group created by CNES in 1977, collects, analyses and archives information o…
Further investigation, however, pointed towards artificial light projections. The observed movements, appearance and timing were found to be consistent with luminous sky animations produced by laser displays or powerful skytracer searchlights. GEIPAN ultimately classified the case as Category B, indicating a probable identification rather than a fully certain one. [UFologie]ufologie.patrickgross.orgCase of Moosch, on September 19, 1990Consequently the GEIPAN classifies in B: observation of luminous animations (laser, skytracer). MOOS…
The significance of Moosch lies in the distinction between Categories A and B. Unlike the Plouarzel case, where the astronomical explanation could be established with high confidence, Moosch involved a reconstruction based on the balance of probabilities. The evidence supported a terrestrial lighting source, but not to the degree required for a definitive A classification. This illustrates GEIPAN’s effort to avoid false certainty while still identifying the most plausible explanation. [Geipan]cnes.fr7 Jul 2025 — GEIPAN, the French UAP research and information group created by CNES in 1977, collects, analyses and archives information o…
What These Cases Reveal About GEIPAN’s Method
Viewed together, these three files reveal several consistent features of the GEIPAN approach.
Plouarzel (1983) demonstrates how astronomical objects can generate convincing UFO reports and how publicity can shape later testimony. [Geipan]cnes.fr7 Jul 2025 — GEIPAN, the French UAP research and information group created by CNES in 1977, collects, analyses and archives information o…
Lyon (1985) shows how rare but natural atmospheric phenomena can initially appear extraordinary, yet become identifiable when witness accounts are compared systematically. [Geipan]cnes.fr7 Jul 2025 — GEIPAN, the French UAP research and information group created by CNES in 1977, collects, analyses and archives information o…
Moosch (1990) illustrates the intermediate territory where investigators cannot prove an explanation absolutely but can identify a highly probable cause and classify the case accordingly. [UFologie]ufologie.patrickgross.orgCase of Moosch, on September 19, 1990Consequently the GEIPAN classifies in B: observation of luminous animations (laser, skytracer). MOOS…
Perhaps the most important lesson is that GEIPAN’s classifications are not judgments about whether witnesses are truthful. In all three cases, investigators treated the reports as genuine observations while concluding that the observed phenomenon had a conventional origin. The archive therefore functions less as a catalogue of extraordinary claims and more as a record of how unusual aerial observations are analysed, tested and resolved. This is precisely why individual case studies remain central to understanding GEIPAN’s role within public UFO report databases and catalogues. [Geipan]cnes.fr7 Jul 2025 — GEIPAN, the French UAP research and information group created by CNES in 1977, collects, analyses and archives information o… [Geipan]cnes.fr7 Jul 2025 — GEIPAN, the French UAP research and information group created by CNES in 1977, collects, analyses and archives information o…
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Endnotes
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Source: cnes-geipan.fr
Link: https://www.cnes-geipan.fr/en/missions-methodes-et-resultatsSource snippet
GeipanMission & Geipan | GEIPANOne or several witnesses are the starting point of a GEIPAN case. They have... However, an eventual recla...
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Source: cnes-geipan.fr
Link: https://www.cnes-geipan.fr/en/node/58787Source snippet
GeipanClassificationA more detailed classification (A/B/C/D1/D2) has been used by the GEIPAN. It is based on 2 main criteria: the weirdne...
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Source: cnes-geipan.fr
Link: https://www.cnes-geipan.fr/fr/cas/1983-03-00968Source snippet
GeipanPLOUARZEL (29) 14.03.19837 Dec 2017 — Le GEIPAN classe le cas en A: méprises astronomiques (Vénus et Arcturus). République Françai...
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Source: cnes-geipan.fr
Link: https://www.cnes-geipan.fr/fr/cas/1985-09-01076Source snippet
GeipanRENTREE ATMOSPHERIQUE (69) 03.09.1985Le 3 septembre 1985 quatre témoins à Lyon (2 témoins) mais aussi à Villefranche-sur-Saône (2 t...
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Source: cnes-geipan.fr
Link: https://www.cnes-geipan.fr/fr/cas/1990-09-01215Source snippet
GeipanMOOSCH (68) 19.09.1990Le 19 septembre 1990 vers 21h45 un couple et deux enfants observent les évolutions dans le ciel couvert d'une...
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Source: ufologie.patrickgross.org
Link: https://www.ufologie.patrickgross.org/alsacat/1990-09-19-moosch.htmSource snippet
Case of Moosch, on September 19, 1990Consequently the GEIPAN classifies in B: observation of luminous animations (laser, skytracer). MOOS...
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Source: cnes-geipan.fr
Link: https://www.cnes-geipan.fr/en/node/58791Source snippet
Its history | GEIPANCases... Classification into A, B, C, D. 6. Anonymizing the files. 7. witness information and publication. 8. How do...
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Source: Wikipedia
Link: https://en.wikipedia.org/wiki/GEIPANSource snippet
GEIPANGEIPAN is clearly focused on UFO study, but UAP (PAN in French) is meant to cover a much broader area than UFO (OVNI in French)...
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Source: cnes.fr
Link: https://cnes.fr/en/projects/geipanSource snippet
7 Jul 2025 — GEIPAN, the French UAP research and information group created by CNES in 1977, collects, analyses and [archives]({{ 'archives/' | relative_url }}) information o...
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Source: youtube.com
Link: https://www.youtube.com/watch?v=hn2xTieploUSource snippet
Geipan: France is also interested in UFOs...
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Source: youtube.com
Title: Geipan: France is also interested in UFOs
Link: https://www.youtube.com/watch?v=OLXDikL331Y -
Source: youtube.com
Title: GEIPAN: Tout savoir sur les OVNIS et Phénomènes Aérospatiaux (PAN)
Link: https://www.youtube.com/watch?v=CWt2zkuxRNQSource snippet
Roswell, the Shocking Investigation by the Former Director of GEIPAN (CNES)...
Additional References
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Source: academia.edu
Link: https://www.academia.edu/101922617/The_Reliability_of_UFO_Witness_Testimony -
Source: cnes-geipan.fr
Link: https://www.cnes-geipan.fr/en/recherche/casSource snippet
Recherche de casThe Geipan. Mission & Geipan · Its history · Documentation · Events; Cases & Testimonials. Case search · Statistics · Cl...
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Source: facebook.com
Link: https://www.facebook.com/groups/MaryMagdaleneFranceTours/posts/3017625505035933/Source snippet
xplained cases in the GEIPAN files. The summary has been...Read more...
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Source: arxiv.org
Link: https://arxiv.org/html/2502.06794v2Source snippet
The New Science of Unidentified Aerospace-Undersea...GEIPAN's mission is to collect, analyze, archive, and publish aerospace observation...
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Source: researchgate.net
Link: https://www.researchgate.net/publication/288389376_Unidentified_Aerial_Phenomena_UAP_A_New_Hypothesis_toward_Their_ExplanationSource snippet
UAP sightings in Hessdalen and most elsewhere.Read more...
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Source: youtube.com
Title: Roswell, the Shocking Investigation by the Former Director of GEIPAN (CNES)!
Link: https://www.youtube.com/watch?v=OJcy6BhB4iISource snippet
Unexplained UFOs near Rennes: filmed reenactment of the Étrelles case...
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Source: youtube.com
Title: Unexplained UFOs near Rennes: filmed reenactment of the Étrelles case
Link: https://www.youtube.com/watch?v=I7MToY5eaBYSource snippet
24 HOURS TO FILM A UFO IN VALENSOLE (shocking revelation)...
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Source: pauldmaley.com
Link: https://pauldmaley.com/sd2/Source snippet
1985 hit a house in Kasambya, Uganda. The sphere caused no damage or injuries. The sphere was measured at 660mm in diameter (26 inches)...
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Source: cnes-geipan.fr
Link: https://www.cnes-geipan.fr/en/recherche/cas/tab?customGetLattitude=45.735486641128446&customGetLongitude=-0.615234375&customGetZoom=5&field_agregation_index_value=&field_date_d_observation_value%5Bmax%5D=&field_date_d_observation_value%5Bmin%5D=&field_date_value=&field_departement_target_id=&field_document_existe_ou_pas_value=All&field_is_new_value=All&field_is_revisited_value=All&field_latitude_value%5Bmax%5D=54.52108149544362&field_latitude_value%5Bmin%5D=36.94989178681327&field_longitude_value%5Bmax%5D=14.326171875000002&field_longitude_value%5Bmin%5D=-15.556640625000002&field_phenomene_target_id=&field_type_de_cas_target_id=All&order=field_date_d_observation&page=32&sort=ascSource snippet
Recherche de cas | GEIPANListe des nouveaux cas; MOIRANS EN MONTAGNE (39) 1985, 26/01/1985, B; ABONDANCE (74) 22.02.1985, 31/01/1985, A...
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Source: youtube.com
Title: 24 HOURS TO FILM A UFO IN VALENSOLE (shocking revelation)
Link: https://www.youtube.com/watch?v=RLP_sXOkFy4Source snippet
Trans-en-Provence Case...
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