I didn’t see that bit, but nonetheless, I did encounter the Alien craft afterwards. That apparently triggers an Alien spacecraft overhead. We’ve attached a couple maps for your ease.
It’s southeast from Vault 111 - but then again, what isn’t? If you’re having trouble, go right up to the top of the map and head east to find Recon Bunker Theta, then head straight down to the school. To do that, head to the Malden Middle School.
[ Update: Our video exploded, so thanks Achievement Hunter!)
