Are all alchemist bombs supernatural abilities?

[Ravingdork]

I ask because many of the bomb types are missing the (SU) tag.

[Grick]

Bomb (Su)

Discoveries in the APG and UM that modify bombs aren't listed with a type, assuming that they just modify the existing Bomb ability.

Discoveries in UM list (Su), maybe just so people remember?

I don't see any reason they wouldn't be considered supernatural anymore.

[Eric Clingenpeel]

Yup, all SU, which really pissed of my dm when we walked through his Rakshasha... :D