The G flat augmented chord is a 3-note chord consisting of the notes Gb, Bb and D.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Gbaug.
Chords that are a superset of Gbaug. The chords include more notes but always Gb, Bb and D.
In case you prefer a non-interactive variant of the chord chart, we've embedded a PNG image below that shows the notes for the the Gbaug chord. Feel free to save or share the image as needed.