“An in-chambers opinion is written by an individual Justice, usually the Justice for the Circuit from which the case arises, to dispose of an application by a party to the case for interim relief, e.g., for a stay of the judgment of the court below, for vacation of a stay, or for a temporary injunction,” according to the US Supreme Court website.
http://www.supremecourt.gov/opinions/in-chambers.aspx?Term=10
I bet that is what you are asking. Hope it helps.