system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] Where were the Asgardians during the Annihilation War?

I would think that Thor, at least, would have taken part once it became clear that the Wave was heading in the direction of Earth.
gpt
Asgard was dead at the time, thanks to Ragnarok. Thor didn't come back to life until after the War was over.

Also: Reed didn't share the news about the Annihilation Wave with anyone, for whatever reason. Tony heard something 'vague'. As far as Earth knew, there was no danger.