Burn notices are issued by intelligence agencies to discredit or announce the dismissal of agents or sources who are considered to have become unreliable.

Don't you need to submit a form to the fire department before a bonfire during the dry seasons?

Burn Notice is the name of an American TV series. A Burn Notice is an official statement by one intelligence agency (such as the FBI / CIA) to other intelligence agencies (at home or abroad) which says that a certain individual or group is unreliable for any variety of reasons. It is an official way of saying that the agencies should disregard or 'burn' any information they get from the individual or group specified in the burn notice..