Mass. Gen. Laws ch. 54 § 116
The governor shall, in the presence of at least five councillors, certify to the results of the examination of the copies of the records of votes cast for governor and lieutenant governor, for councillors, for state secretary, state treasurer, state auditor and attorney general, and for senators and representatives in the general court, and shall issue his summons to such persons as appear to be chosen to said offices. The governor shall issue certificates of election to such persons as appear to be chosen to the offices of senator in congress, representative in congress, clerk of the courts, register of probate, sheriff and district attorney, which shall be countersigned and transmitted by the state secretary. No certification shall be made or summons or certificate issued under this section until after five o'clock in the afternoon of the fifteenth day following a state election, or, in case a state-wide or district-wide recount is held in accordance with section one hundred and thirty-five, until the tabulation and determination under the preceding section have been revised in accordance with the results of such recount; provided, however, that such certification may be made or summons or certificate issued on or after the seventh day following a special state election, unless a candidate who received votes at that election files with the state secretary, not later than five o'clock in the afternoon of the sixth day following the election, a written statement of intention to seek a recount or otherwise to contest the election.
Mass. Gen. Laws ch. 54, § 116