If received Stafford Loans for whole year are you on the hook for spring?

Hi I kind of procrastinated to the last minute and now need to get my financial aid together quickly. I was wondering though since you have to accept the stafford loans based on the entire school year(Fall&Spring semester) before the start of first semester, If I was to decide to transfer in the spring to another school would I be on the hook for those loans or is there a period of time to cancel them before they are disbursed. Basically I'm asking are the loans for the spring disbursed now also and cannot be refused before the start of spring semester or can they be.