"There's no way to tell just where the signal originates?"
So why were they heading there when no intelligent signals originated from it?
What do we have at the coordinates the signal originated from?
But this signal, you claim, originated from outside the galaxy.
Where the signals had originated could be soon clarified.
It had taken them over an hour to get here, where the satellite told them the signals were originating.
The signal originated from a Klingon vessel without authorization to be where it was.
Unfortunately, she had no way to tell where those signals originated from or went to--or even what they said.
In a receiver, the receiving path starts with the signal originating at the antenna.
Logically, the signal must therefore originate from a ship or a starbase of some sort.