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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.

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Case of Strasbourg Cronenbourg, on April 30, 2016:

Case number:



On May 3, 2016, a lady reported to me by email her observation, to possibly get an explanation.

She was driving with her husband in the evening of Saturday, April 30, 2016, around 11:30 p.m. They had left friends in Strasbourg to take the way back home. She notes that it was dark night, it was still raining but she is not sure.

They were at the CTS bus depot at the large Cronenbourg roundabout to take the junction to the Haguenau motorway.

At this place, looking up, she saw three spots that moved relatively slowly over them. These three spots belonged to a triangular craft, the spots being located in each of its corners. She was able to clearly distinguish this form because it flew quite low and slow, and her husband was able to turn his head and observe it too.

Her husband thought of a fighter plane but it was according to his wife at too low altitude, not making any noise, in any case, no noise she remembered having perceived from inside the car. She thought of a drone, but the machine seemed far too big.

On May 6, 2016, I asked the relevant questions by e-mail (such as duration, apparent size), but I did not get an answer so far.


Temporal data:

Date: April 30, 2016
Time: ~11:30p.m.
Duration: ?
First known report date: May 3, 2016
Reporting delay: 3 days.

Geographical data:

Department: Bas-Rhin
City: Strasbourg
Place: In car driving in the Cronenbourg district at the turnpike near the CTS depot, UFO in the sky.
Latitude: 48.594
Longitude: 7.739
Uncertainty ratio: 500 m

Witnesses data:

Number of alleged witnesses: 2
Number of known witnesses: 1
Number of named witnesses: 1
Witness(es) ages: Adults.
Witness(es) types: A couple.

Ufology data:

Reporting channel: Email to me.
Type of location: Driving in car on turnpike, UFO in the sky.
Visibility conditions: Night.
UFO observed: Yes
UFO arrival observed: No
UFO departure observed: ?
Entities: No
Photographs: No.
Sketch(s) by witness(es): No.
Sketch(es) approved by witness(es): No.
Witness(es) feelings: Puzzled.
Witnesses interpretation: ?


Hynek: NL or CE1
ALSACAT: Not enough information.


[Ref. pgs1:] EMAIL SENT TO ME:

Subject: UFO sighting
Sent on: May 3, 2016
By: [Firstname] [Lastname] ([lastname]@[supplier].com)

Good evening,

I turn to you to maybe get an explanation.

I was driving with my husband in the evening of Saturday, it was about 11:30 p.m.. We had left friends on Strasbourg to take the way back home.

So we were by car at the level of the cts bus depot on the side, at the big roundabout in Cronenbourg to take the junction on the motorway direction Haguenau.

It was dark, it was still raining but I'm not sure.

And there, looking up, I see 3 spots that move relatively slowly above us. These 3 spots belong to a triangular craft and are in each of its angles. I could clearly distinguish this form because it flew low enough and slow enough so that my husband was able turn his head and observe it too.

It seems quite too crazy to believe!

My husband refers to a fighter plane but it was, in my opinion, at a too low altitude and did not make any noise, in any case I do not remember hearing anything inside the car . I thought of a drone, but the machine seems too huge.

Could you enlighten me?

Good night
[First name]

I replied by email on May 6, 2016:


thank you for sharing your observation. I would like to ask a few things.

I would like to know the apparent size of the phenomenon. I do not want whether it was 1 meter, 10 meters, 100 meters, it is not possible to evaluate the size of the unknown phenomenon. What interests me is what is called the "angular size", the apparent size. To tell me, you can simply review the observation while extending your arm and tell whether it was as wide as a pencil point at the end of the arm, or as wide as one finger, or as wide as the hand, etc.

Then I would like to know the direction in which it was seen. I understand that at the beginning, it was above your vehicle, But then? If you drove north, was it left behind, or left, right, or out? How did the observation end?

Can you tell me the speed, even approximate, at which you drove, and the duration of the observation?

Thank you in advance.

Patrick Gross

I did not get an answer to this day.



Cronenbourg is a district of Strasbourg, located in the West of Strasbourg.


Above: The CTS bus depot, the turnpike, the red line indicates the motorway to Haguenau; which is in the North, that the witnesses were about to take.

Without the answers to my questions, I cannot say much about this observation whose strangeness remains uncertain.


Not enough information.

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 July 24, 2016 Creation, [pgs1].
1.0 Patrick Gross July 24, 2016 First published.

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This page was last updated on July 24, 2016.