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ALSACAT is my comprehensive catalog of UFO sighting reports in Alsace, the region is the North-East of France, whether they are "explained" or "unexplained".

The ALSACAT catalog is made of case files with a case number, summary, quantitative information (date, location, number of witnesses...), classifications, all sources mentioning the case with their references, a discussion of the case in order to evaluate its causes, and a history of the changes made to the file. A general index and thematic sub-catalogs give access to these Alsatian case files.

Case of Strasbourg, on September 3, 1970:

Case number:



In the early 1970s, the French ufology magazine "Lumières Dans La Nuit" had explained to its readers how to build a "UFO detector".

The device was essentially like a compass, with an alarm sounding if the needle moved. It was considered that UFOs may produce a magnetic field as they passed, and that the alarm would make it possible to watch a passing UFO when the detector rung. The magazine regularly published lists of such "alarms."

In their February 1971 issue, we learned that in Strasbourg such a "UFO detector" sounded for two minutes on September 3, 1970, at 10:30; but the sky was totally cloudy and no UFO was therefore seen.


Temporal data:

Date: September 3, 1970
Time: 10:30
Duration: 2 minutes.
First known report date: February 1971
Reporting delay: 5 months.

Geographical data:

Department: Bas-Rhin
City: Strasbourg
Latitude: 48.574
Longitude: 7.752
Uncertainty ratio: 10 km

Witnesses data:

Number of alleged witnesses: 1
Number of known witnesses: 0
Number of named witnesses: 0
Witness(es) ages: ?
Witness(es) types: ?

Ufology data:

Reporting channel: Ufology magazine "Lumières Dans La Nuit."?
Type of location: ?
Visibility conditions: totally covered sky.
UFO observed: N/A
UFO arrival observed: N/A
UFO departure observed: N/A
Entities: No
Photographs: No.
Sketch(s) by witness(es): No.
Sketch(es) approved by witness(es): No.
Witness(es) feelings: ?
Witnesses interpretation: ?


Hynek: ?
ALSACAT: Insufficient data.




Detectors alarms

[...Other cases...]


Alarm on September 3, 1970 at 10 : 30 and for two minutes. Sky totally cloudy, nothing was observed.

[...Other cases...]

Note: this is an alert among thers about what would be a "UFO" detected by a "UFO detector" using a compass system designed by Dr. René Hardy. The magazine gave a list of these "alerts", including this one.



Of course this is a "case" that did not enter UFO history...


Insufficient data.

Sources references:

* = Source is available to me.
? = Source I am told about but could not get so far. Help needed.

File history:


Main author: Patrick Gross
Contributors: None
Reviewers: None
Editor: Patrick Gross

Changes history:

Version: Create/changed by: Date: Description:
0.1 Patrick Gross September 3, 2017 Creation, [ldl1].
1.0 Patrick Gross September 3, 2017 First published.

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This page was last updated on September 3, 2017.