Sighting in Groisy, October 1, 2013

At around 9:30 pm, a witness at home noticed a light on the horizon. Together with their partner, they then saw the light disappear, followed by three flashing lights crossing the sky quickly. The lights passed with a resonant noise that sounded like an aircraft.

The investigation rated the case as moderately strange and of low consistency, since it rested on a single account and the sighting was brief. It considered a misidentification of the star Arcturus, followed by a formation of aircraft passing over. This could not be confirmed: the witness's account and sketches gave different directions, and no information on air traffic was available. The GEIPAN stressed that the witness's visual perception was not in question, but rather the interpretation they made of what they saw, shaped by how they felt (surprise, a nighttime observation). Because nothing was available to verify these hypotheses, the case was classified C, insufficient data.