CORROBORATED
CF-GEI-20110302728 CORROBORATED
The Lieusaint Meteor Trail
CASE FILE — CF-GEI-20110302728 — CASEFILES CLASSIFIED ARCHIVE
Date Date when the incident was reported or occurred
2011-03-21
Location Reported location of the sighting or event
Lieusaint, Seine-et-Marne, Île-de-France, France
Duration Estimated duration of the observed phenomenon
a few 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
1
Country Country where the incident took place
FR
AI Confidence AI-generated credibility score based on source reliability, detail consistency, and corroboration
85%
On March 21, 2011, at precisely 5:03 AM, a single witness in Lieusaint, a commune in the Seine-et-Marne department of the Île-de-France region, observed a brief but distinctive aerial phenomenon. The witness reported seeing a silent, yellow-orange colored trail moving across the sky in a descending trajectory from east to northeast. The observation lasted only a few seconds before the phenomenon disappeared from view.
This case was officially investigated by GEIPAN (Groupe d'Études et d'Informations sur les Phénomènes Aérospatiaux Non Identifiés), France's official UAP investigation organization operated by CNES (Centre National d'Études Spatiales). The sighting occurred during early morning hours when the sky would have been dark, providing good visibility conditions for observing aerial phenomena. The witness was apparently alone at the time of the observation.
GEIPAN classified this case as 'B', indicating a phenomenon that was probably identified with a high degree of certainty. The investigators concluded that the witness most likely observed atmospheric reentry—specifically, a meteorite entering Earth's atmosphere. According to GEIPAN's analysis, the description provided by the witness matches completely with the typical appearance of a meteor fall, including the characteristic color, trajectory, brief duration, and silent passage.
02 Timeline of Events
05:03
Initial Observation
Witness observes a yellow-orange colored trail appearing in the sky, moving silently in a descending trajectory from east to northeast.
05:03 + few seconds
Phenomenon Disappears
After several seconds of observation, the luminous trail disappears from view, consistent with a meteor completing its atmospheric passage.
Post-event
Report Filed with GEIPAN
Witness submits report to GEIPAN, France's official UAP investigation organization, triggering case number 2011-03-02728.
Investigation period
GEIPAN Classification
After investigation, GEIPAN assigns a 'B' classification, indicating probable identification as a meteorite reentry. Analysis confirms description matches typical meteor characteristics.
03 Key Witnesses
Anonymous Witness 1
civilian
medium
Single witness who observed the phenomenon during early morning hours in Lieusaint, France. Provided description consistent with meteor observation.
"A silent yellow-orange trail moving in a descending trajectory from east to northeast, lasting only a few seconds."
04 Analyst Notes -- AI Processed
This case represents a textbook example of a correctly identified natural phenomenon. The witness description aligns perfectly with known characteristics of meteor events: the yellow-orange coloration is consistent with atmospheric heating of a meteorite, the descending trajectory from east to northeast follows typical meteor paths, the brief duration of 'a few seconds' matches the rapid passage of space debris through the atmosphere, and the silent nature rules out aircraft or other man-made objects that would produce engine noise.
The credibility of this case is enhanced by GEIPAN's official investigation and classification system. A 'B' classification indicates that investigators had sufficient information to make a probable identification with reasonable confidence. The early morning timing (5:03 AM) suggests good observation conditions with minimal light pollution and a dark sky background. However, the single witness account and brief observation window limit the overall evidentiary value. No corroborating reports from other witnesses in the region are mentioned, though this is common for brief meteor events that occur during early morning hours when few people are awake and observing the sky.
05 Theory Comparison
BELIEVER ANALYSIS
SKEPTIC ANALYSIS
Aircraft with Landing Lights
A skeptical alternative might suggest the witness observed an aircraft on approach to a regional airport with landing lights visible. However, this theory fails to account for several key factors: the described descending trajectory that ended quickly rather than continuing to an airport, the specific yellow-orange coloration uncommon for aircraft lights, the complete silence (aircraft produce audible engine noise especially in early morning quiet), and the very brief observation duration. This explanation is inconsistent with the evidence and properly rejected by investigators.
06 Verdict
ANALYST VERDICT
This case is conclusively explained as a natural astronomical phenomenon—a meteor entering Earth's atmosphere. The GEIPAN classification of 'B' (probable identification) is well-justified by the evidence. Every aspect of the witness description matches known meteor characteristics, and no anomalous features are present that would suggest an alternative explanation. While the case holds minimal scientific significance due to the commonplace nature of meteor observations, it demonstrates the value of systematic investigation in distinguishing between truly unexplained phenomena and well-understood natural events. The case serves educational value in illustrating what a typical meteor sighting looks like and how official investigation protocols successfully identify conventional explanations.
AI CONFIDENCE SCORE:
85%
07 Community Discussion
VIEW ALL >// NO COMMENTS YET
Be the first field agent to contribute analysis on this case.
08 Live Chat 1 ROOM
ENTER LIVE CHAT
Real-time discussion with other field agents analyzing this case.