CORROBORATED
CF-GEI-19900801211 CORROBORATED
The Lassay-les-Châteaux Farm Lights
CASE FILE — CF-GEI-19900801211 — CASEFILES CLASSIFIED ARCHIVE
Date Date when the incident was reported or occurred
1990-08-19
Location Reported location of the sighting or event
Lassay-les-Châteaux, Mayenne, France
Duration Estimated duration of the observed phenomenon
6 minutes total (1 minute + 5 minutes)
Object Type Classification of the observed object based on witness descriptions
light
Source Origin database or archive this case was sourced from
geipan
Witnesses Number of known witnesses who reported the event
2
Country Country where the incident took place
FR
AI Confidence AI-generated credibility score based on source reliability, detail consistency, and corroboration
85%
On August 19, 1990, at approximately 22:45 hours, a farmer in Lassay-les-Châteaux observed unusual lights above his farm property. The primary witness first observed a green oval-shaped form hovering above a farm building for approximately one minute while standing in the farmyard. He then called his wife, and together from their residence, they observed red-orange glows above the stabulation building (livestock housing) for an additional five minutes. Concerned by the phenomenon, the witness contacted the Gendarmerie (French national police), but the lights had disappeared by the time officers arrived on scene.
The case prompted a thorough official investigation by GEIPAN (the French national UFO investigation agency) and local gendarmerie. In October 1990, two months after the incident, investigators conducted field experiments including test firings of low-power fireworks rockets to compare with the witness's observations. While the witness did not recognize the test fireworks as matching what he saw, investigators noted he was not observing under the same psychological conditions—he knew what he was about to see, unlike the original spontaneous sighting.
Crucially, investigators discovered that a fireworks display had been conducted on the same evening (August 19, 1990) in the nearby commune of Charchigné, also in the Mayenne department. The fireworks occurred during the same time window as the observation and, significantly, Charchigné lies in the same direction from the farm as the observed phenomenon. This correlation led GEIPAN to classify the case as 'B' (probable identification) with fireworks as the most likely explanation. The gendarmerie proposed a follow-up validation experiment the following year to definitively confirm the fireworks hypothesis by observing another fireworks display from the witness location.
02 Timeline of Events
22:45
Initial Green Oval Observation
Primary witness observes a green oval-shaped form hovering above a farm building while in the farmyard. Duration: approximately 1 minute.
22:46
Wife Called as Second Witness
Witness calls his wife to observe the phenomenon. They relocate to their residence for better viewing position.
22:46-22:51
Red-Orange Lights Observed
Both witnesses observe red-orange glows above the stabulation building (livestock housing) for approximately 5 minutes.
22:50
Gendarmerie Contacted
Witness contacts the Gendarmerie to report the phenomenon while still observing it.
~23:00
Gendarmerie Arrival
Gendarmerie officers arrive at the farm location. The phenomenon has already disappeared.
October 1990
Field Experiments Conducted
Gendarmerie conducts various tests including firing low-power fireworks rockets. Witness observes but does not recognize them as matching the original phenomenon.
October 1990
Fireworks Display Discovered
Investigation reveals fireworks were fired in Charchigné on August 19, 1990, in the same direction and time frame as the observation.
1991 (proposed)
Validation Experiment Planned
Gendarmerie proposes returning to the farm to observe another fireworks display for definitive validation of the hypothesis.
03 Key Witnesses
Anonymous Witness 1
Farmer/farm owner
medium
Primary witness, farm resident in Lassay-les-Châteaux. Contacted authorities immediately during the event and cooperated fully with subsequent investigation and field experiments.
"The witness did not recognize the test fireworks as matching the original phenomenon, though he acknowledged he was not in the same observational conditions."
Anonymous Witness 2
Spouse of primary witness
medium
Secondary witness, called by primary witness to observe the red-orange lights phase of the phenomenon from their residence.
04 Analyst Notes -- AI Processed
This case demonstrates exemplary investigative methodology by French authorities. The gendarmerie's commitment to conducting field experiments, including recreating potential stimulus conditions, shows scientific rigor. The witness credibility appears moderate to high—he reported the phenomenon to authorities immediately and cooperated fully with the investigation. The fact that he contacted police during the event suggests genuine concern rather than attention-seeking behavior.
Several factors support the fireworks explanation: (1) confirmed fireworks display in Charchigné at the exact time and in the correct direction; (2) the described colors (green, red-orange) are consistent with pyrotechnic effects; (3) the stationary nature and duration match fireworks behavior; (4) the rural setting with potential atmospheric conditions could enhance visibility and create illusion of proximity. The witness's failure to recognize test fireworks is not necessarily contradictory—psychological factors including expectation bias, different atmospheric conditions, and the spontaneous nature of the original observation all affect perception. The classification as 'B' rather than 'A' (certain identification) reflects appropriate scientific caution, acknowledging the lack of absolute certainty despite strong circumstantial evidence.
05 Theory Comparison
BELIEVER ANALYSIS
SKEPTIC ANALYSIS
Psychological Expectation Bias in Testing
The witness's failure to recognize test fireworks in October may indicate the original phenomenon was genuinely different, or it may demonstrate that psychological factors significantly affect perception. When the witness knew he was about to see fireworks during testing, his brain processed the visual information differently than during the spontaneous original observation. This is a well-documented psychological phenomenon that doesn't invalidate the fireworks hypothesis but complicates simple confirmation.
06 Verdict
ANALYST VERDICT
This case is almost certainly explained as a misidentification of a fireworks display from the neighboring commune of Charchigné. The temporal and directional correlation is compelling, and the described characteristics match pyrotechnic effects. While we cannot achieve 100% certainty without witness confirmation during a controlled re-creation, the evidence strongly supports the fireworks hypothesis. This case is significant primarily as an example of thorough official investigation methodology rather than for its anomalous content. The GEIPAN 'B' classification is appropriate and well-justified. The case holds minimal mystery and demonstrates how mundane phenomena can appear unusual when viewed from a distance under unexpected circumstances.
AI CONFIDENCE SCORE:
85%
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