Yes, you should have the option of requesting an In School Deferment from from your federal student loan servicer. If you are in gradudate school then you are considered a full time student and your servicer should grant you the In School Deferment based on that information. You can either have your school transmit your enrollment status to the Department of Education who would then notify your servicer electronically, however, I would actually walk the form through admissions if possible. Your school should have copies of the forms for you. After getting the necessary signatures and stamps you then can fax in the deferment form to your servicers and have a copy for your records showing the date and time that you applied for the Inschool Deferment.
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