Flash Bang Grenade

 is a scripted weapon $$

Gameplay
It is encountered during the escape from Vault 87. The Enclave deploys it against the Lone Wanderer, knocking them out to transport the player to the Raven Rock prison facility. There is no way to avoid capture by the Enclave once the grenade has gone off, as it triggers a scripted event.

The player character can get close enough to see what the grenade is but cannot pick it up. The only option available is "Activate". Using the console to add this grenade is possible, but attempting to use it will either crash the game or immediately start The American Dream.