Does the NSNotification retain the object?

My question is in regards the object that gets added to a -postNotificationName:object: userInfo: method.

Does the NSNotification retain the object ? (in a similar fashion to NSMutableDictionary or Array) ... meaning I can release the object after posting the notification

Below is a code snippet to help describe my question ... is it valid to release the object. A link to Apple documentation could be really helpful.

NSMutableDictionary *teamDictCopy = [self.teamDict mutableCopy];
[teamDictCopy setObject:[NSNumber numberWithInt:self.scrollViewIndex] forKey:@"imageIndex"];

if([self.statusButton.title isEqualToString:@"Completed"]){
    [[NSNotificationCenter defaultCenter] postNotificationName:@"UnComplete" object:teamDictCopy userInfo:nil];
}

[teamDictCopy release];