The note can be found at ATLAS Observatory. It is located past the red machinery, down the stairs, and on the white table directly ahead.
NOTE TO SELF:
Don't name the 'bots anymore. Numbers only from now on.
The one I'd nicknamed Grabby wandered a bit too far yesterday and got wrecked by a herd of radstag that stampeded through the woods. A busted 'bot doesn't normally make me sad, but I couldn't help but feel like Grabby had died rather than I had another Protectron to repair.
Stick to numbers. Safer.