Aware Of Location
When you are aware of a creature’s location, you know exactly where the creature is located, but you still can’t observe the creature with a precise sense such as vision. Generally, this occurs because you have blindsense, or because the creature is hidden but you have succeeded at a Perception check to search for the creature with an imprecise sense. You must at least be aware of a creature’s location in order to directly attack it, though it is considered to have total concealment from you (see page 253). It is, however, subject to area effects affecting that location.
Source
Core Rulebook pg. 260