137.247—What is the effective date of a retrocession?
         Unless the request for retrocession is rescinded, the retrocession becomes effective within the timeframe specified by the parties in the compact or funding agreement. In the absence of a specification, the retrocession becomes effective on:
    
    
    
    
    
        
        (b) 
         Whatever date is mutually agreed upon by the Secretary and the retroceding Self-Governance Tribe.