Light in the Horizon at Grouchy

Summary

On October 1, 2013, a witness in Grouisy (France) observed a light on the horizon that quickly disappeared, followed by three blinking lights. The report mentions a sound similar to that of an airplane, though the observation was brief and occurred at night. Although the possibility of it being the star Arcturus or a formation of aircraft was considered, the lack of precision in the description and absence of air traffic data prevented a clear identification. The case was classified as C due to insufficient information to confirm or rule out the proposed hypotheses.