There is no evidence as to what "Gulnara" is. It could be anything from a planet or moon to the name of some guy involved for all we know. There is no way to know one way or the other.
Talania is even more of a mystery. It isn't on any node map that we know of (I know, I've looked, I've sworn I've seen it, but nothing).
Most likely, each battle bracketed a major push into Vasudan space, possibly featuring the invasion of Vasuda Prime itself. Again, there's no evidence that this is true. We just don't know.
My theory basically make Gulnara a moon in Antares that the battle happened near. I won't make any arguements for Talania though (I still want it to be a full blown system).