The panel was appointedafter Tuesday's parliamentary debate on the issue and has been tasked to come out with the findings within 3 months.
Sirisena has appointed two sitting Supreme Court judges and a retired Auditor General to probe the bond scam which has caused fissures in the current government headed by him and his Prime Minister Ranil Wickremesinghe, the President's office said.
Former Governor of Central Bank Arjuna Mahendran and his son in law connected with a primary dealer firm are accused of benfitting from insider information during two issues of bonds in February 2015 and March 2016.
Sirisena said he was not in agreement with a civil case and wanted criminal charges pursued on the issue.
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Mahendran was Wickremesinghe's nominee for the bank's boss.
After his alleged involvement in wrong doings, Sirisena did not extend Mahendran's term and appointed a successor.
The analysts say the bond issue has triggered a widening rift in the unity government amid a public campaign by former President Mahinda Rajapaksa to return to power.