The web site of the Observatory of Besançon has been recently reorganized.
The english version of the site is not yet available.
In between, you can access the french version of the site

Observatoire des Sciences de l'Univers de Besançon
UMR CNRS 6091

41 bis, avenue de l'Observatoire
B.P. 1615
25010 Besançon Cedex - France
Téléphone : +33 (0)3 81 66 69 00
Télécopie : +33 (0)3 81 66 69 44