CORROBORATED
CF-GEI-20170950434 CORROBORATED

The Montrevel Fireball: Multi-Witness Bolide Event

CASE FILE — CF-GEI-20170950434 — CASEFILES CLASSIFIED ARCHIVE
Date Date when the incident was reported or occurred
2017-09-10
Location Reported location of the sighting or event
Montrevel, Isère, France
Duration Estimated duration of the observed phenomenon
1-2 seconds
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
25
Country Country where the incident took place
FR
AI Confidence AI-generated credibility score based on source reliability, detail consistency, and corroboration
85%
On September 10, 2017, at approximately 21:45-22:00 local time, a witness in Montrevel, Isère, France observed a brief but intense luminous phenomenon while tending to their child. The witness described a round, bright yellow-orange light appearing to be "on fire" that descended rapidly and silently across the sky before disappearing. The entire observation lasted only 1-2 seconds. The witness was sufficiently convinced of the object's proximity that they rushed to the window and conducted ground searches the following morning, finding nothing. This sighting was not an isolated incident. At least 25 other witnesses across a vast geographical area—from Meurthe-et-Moselle to Bouches-du-Rhône, including Pyrénées-Orientales, Isère, and Switzerland—reported observing the same phenomenon at 19:29 UTC (21:29 local French time). The event was captured by 14 cameras of the FRIPON (Fireball Recovery and InterPlanetary Observation Network), confirming it as a meteoroid atmospheric entry. Scientific analysis indicated the meteoroid fragmented into multiple pieces at the end of its luminous trajectory. The witness's reported time (21:45-22:00) differs from the confirmed bolide passage (21:29), but GEIPAN investigators note the witness did not check their clock at the exact moment of observation. The witness also estimated the altitude as approximately 4 meters, a common perceptual error; bolides typically occur at 50-100 km altitude but appear much closer due to their extreme brightness. GEIPAN classified this case as "A" (identified with certainty) based on the correlation with the widely-observed and instrumentally-detected bolide.
02 Timeline of Events
21:29
Bolide Atmospheric Entry (Confirmed Time)
Meteoroid enters Earth's atmosphere at 19:29 UTC (21:29 local French time). Event detected by 14 FRIPON network cameras across France and Switzerland.
21:29-21:31
Multi-Witness Observations Begin
At least 25 witnesses across regions from Meurthe-et-Moselle to Bouches-du-Rhône, including Pyrénées-Orientales, Isère, and Switzerland observe bright descending light.
21:45-22:00 (approx)
Montrevel Witness Observation
Primary witness observes brilliant yellow-orange round light with descending trajectory for 1-2 seconds while at home with child. Witness rushes to window but light has vanished.
End of trajectory
Meteoroid Fragmentation
Scientific analysis reveals meteoroid fragmented into multiple pieces at the end of its luminous trajectory.
September 11, 2017 (morning)
Ground Search Conducted
Witness conducts unsuccessful ground search near residence, believing object may have landed nearby.
Post-investigation
GEIPAN Classification: A
GEIPAN reviews witness testimony, FRIPON data, and 25+ corroborating reports. Case classified as 'A' - identified with certainty as bolide observation.
03 Key Witnesses
Anonymous Witness 1
Civilian parent
medium
Local resident of Montrevel who was caring for their child at the time of observation. Demonstrated diligence by conducting follow-up ground searches.
"L'objet est décrit comme ayant une forme ronde, en feu, de couleur jaune-orange qui tombe sans bruit."
04 Analyst Notes -- AI Processed
This case exemplifies the value of coordinated observation networks and official investigation in resolving apparent anomalies. The FRIPON network's instrumental detection of the bolide at 21:29 provides objective verification that would be impossible from witness testimony alone. The slight time discrepancy (16-31 minutes) is easily explained by the witness's acknowledgment of not checking the time precisely during the event—a common issue in sudden, brief sightings. The witness's credibility is actually enhanced by their honest reporting of details that initially seemed inconsistent. The description of a "round, fiery, yellow-orange light with descending trajectory" perfectly matches bolide characteristics. The witness's interpretation of extreme proximity (4m altitude) demonstrates a well-documented psychological phenomenon where brilliant objects appear much closer than reality. Bolides at 50-100 km altitude are visible across approximately 200 km diameter zones, explaining the geographic spread of reports. The witness's search for debris the following morning, while unsuccessful, shows genuine engagement and lack of sensationalism.
05 Theory Comparison
BELIEVER ANALYSIS
SKEPTIC ANALYSIS
Perceptual Error in Proximity Assessment
The witness's estimation of 4 meters altitude represents a common perceptual error when observing brilliant celestial phenomena. Without objective reference points and due to the extreme brightness, the witness intuitively interpreted the bolide as very close. This psychological phenomenon is well-documented in meteor observation studies. The actual event occurred at 50-100 km altitude, visible across a 200 km diameter zone, explaining why ground searches found no debris.
06 Verdict
ANALYST VERDICT
This case is definitively explained as an observation of a meteoroid atmospheric entry (bolide) on September 10, 2017. Confidence level: very high. The witness's description aligns perfectly with 24+ other testimonies and, critically, with instrumental detection by 14 FRIPON network cameras. The slight temporal discrepancy is attributable to normal memory imprecision when precise timing wasn't recorded at the moment of observation. This case holds significance primarily as an excellent example of how scientific monitoring networks can validate witness reports and resolve apparent mysteries. It also illustrates common perceptual errors (distance/altitude estimation) that must be considered when evaluating UAP reports. GEIPAN's "A" classification is fully justified.
AI CONFIDENCE SCORE:
85%
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