Time: Upon killing bosses in specific dungeons
Frequency: Always
World name: Excalibur
Character name: Dudude Dude
NPC name: None
Monster name: Nidhogg, Ser Charibert
Class/Level: PLD 55, BRD 58
Party or solo: Party (4)
In-game time: Not relevant.
Area and coordinates: The Aery (11,9), The Vault (11,11)
Steps:
1. Be dead when the boss dies.
2. Receive experience anyway, unlike other dungeons in the game.

I will also add that personally I would rather see this behavior be present throughout all dungeons in the game, but as it stands these two dungeons and these two particular bosses are the only two (That I know of) that award the boss kill experience if you are dead when the boss dies.

Also worth mentioning is that this only applies to the experience from killing the boss itself, roulette bonuses don't care either way whether you or alive or dead, merely that you were in the dungeon when it finished.