Bound Bow is a Conjuration spell at the Adept level.
The Bound Bow creates a magic bow for 120 seconds. To dispel the bow, you must sheathe it or equip another spell/weapon in said hand. Bound Bow's strength increases respectively with your Conjuration skill and goes hand-in-hand with how the bow will inflict damage.
Bound Bow takes 124 magicka to cast and will stay casted for 120 seconds. You must reuse the spell if you sheathe or have it equipped for more than said duration of time.