The Secretary-General initiated the inquiry last March to establish the facts and draw conclusions as to the UN's response to the tragedy.
The three-man panel is headed by former Swedish Prime Minister Ingvar Carlsson. Its other members are Han Sung-Joo, former Foreign Minister of the Republic of Korea, and General Rufus Modupe Kupolati of Nigeria.
The Secretary-General was expected to transmit the report to the Security Council early Wednesday evening, his spokesman said today. He added that the report would be available on the UN Web site Thursday morning, when the panel is scheduled to present its findings at a UN press conference in New York.