The procedures upon the death of a Supreme Pontiff are governed by the Apostolic Constitution, Universi Domenici Gregis, dating to February 22, 1996. The text can be found here: Apostolic Constitution Universi Dominici Gregis.
Upon the death of a pope, the government of the Catholic Church enters a period known as the sede vacante, literally, empty seat; referred to also as an interregnum, between reigns (links at The See of Peter).
Of interest, at this point, from the Apostolic Constitution mentioned above:
Chapter V – The funeral rites of the Roman Pontiff
30. No one is permitted to use any means whatsoever in order to photograph or film the Supreme Pontiff either on his sickbed or after death, or to record his words for subsequent reproduction. If after the Pope’s death anyone should wish to take photographs of him for documentary purposes, he must ask permission from the Cardinal Camerlengo of Holy Roman Church, who will not however permit the taking of photographs of the Supreme Pontiff except attired m pontifical vestments.
Full title of the Pope: Bishop of Rome,Vicar of Christ, Successor of the Prince of the Apostles, Supreme Pontiff of the Universal Church, Patriarch of the West, Primate of Italy, Archbishop and Metropolitan of the Roman Province, Sovereign of The State of Vatican City, Servant of the Servants of God”
Interesting reading: The Pope Blog
