Bassrath-Kata is a unique longbow in Dragon Age II.
Acquisition
This weapon is obtained by completing the Act 3 The Lost Swords quest as an archer rogue, if Hawke does not ask for a reward and has either Bursting Arrow or Pinning Shot.
See also
Bassrath-Kata (greatsword)
Bassrath-Kata (longsword)
Bassrath-Kata (staff)
Bassrath-Kata (dagger)