Certainly seems like the chord is a C# diminished--generally though, C#-" is used to indicate C#minor--I have a feeling that, like so many pieces of sheet music, the chords could be improved--don't know what song you're playing, but that progression sounds a bit odd when played like that. It sounds better if you use a C minor where the C#- is--of course, it might not fit the song--

What song are you playing?