Situational Information Report

Overview
A Situational Information Report (SIR) is a vehicle for field offices to share locally-derived information on criminal or domestic terrorism matters that are relevant or of interest to only entities within their domain, such as state, local, and tribal law enforcement partners. Because the information is typically operational in nature and actionable by or relevant to only a limited audience in specific domains, it usually does not meet the same criteria that the FBI has established for intelligence products such as IIRs, IBs, ISs, or IAs.

Source
Federal Bureau of Investigation, FBI Information Sharing Report 2010 (full-text).