change object's rotation inside animation window via script?

is it possible to change an object's rotation inside animation window via script?? for example I want to change left-hand's rotation at frame 6 to -40,but via script.not inside animation window.

my character can pick lot's of items,some of them need his hand to rotate a lot and others need less rotate.can someone help me with this? i don't want to create lot's of animations to handle it.

 

You can use animation events that are triggered from within the animation. Right click on the time line and choose Add Animation Event. Then, you can choose to trigger a public method on your object.

 

very good idea,thanks alot

 

@PGJ ,now i'm using an animation event at frame 0 it sets hand's position and rotation.(for every gun).

for example when i pick a gun it sets position and rotation of the hand.but at frame 0,how can I change rotation for example at frame 6? i mean when I pick a gun, rotation at frame 0 is 10,I want it to be 50 at frame 6,and hand should rotates from frame 0 to 6??? i'm using this because every gun has a different rotation between frame 0 to 6 and I have no idea how to do it

 

Is your gun just following the hand? Can't you just set it as a child of the hand, then it will follow the hand as it animates. Or am I missing something?

 

it's a 2d game.
when i pick a gun,it will be child of the hand ,yes,but I want to rotate the hand not the gun,so when i have a colt ,player has an idle animation and his hand rotation should be 0 at frame 0 and it should be 50 at frame 6,if i pick a M16 his hand rotation should be 25 at frame 0 and it should be 40 at frame 6,so i need a function to rotate his hand i just don't know how to set min and max rotation for this function.

https://forum.unity.com/attachments/untitled-png.267895/

as you can see in this image if i could use a variable and just change it's value to change rotation it will solve all the problems