All I could find about this case is a small sketch presented in a web page titled "UFO photos" on the website of the Alsatian ufology association SPICA:
What could I possibly say? For the moment, it was impossible for me to find any other mention of a UFO in Schwindratzheim in 1997.
Evaluation:
Totally insufficient information.
Sources references:
* = Source is available to me.
? = Source I am told about but could not get so far. Help needed.
[spa1] * "Photos d'OVNI", web page by the ufology association "SPICA", Alsace, France, not dated, found in 2017, at http://www.spica.org/Page_Photos_OVNI.htm#3-9