Sirna, a moon orbiting the Outer Rim planet Aaloth, was situated within the Gaulus sector.
The audio drama The High Republic: Tempest Runner, penned by Cavan Scott and released in 2021, contained flashbacks that referenced Sirna. Because Tempest Runner was initially available only as an audio production, the precise spelling of the moon's designation wasn't verified until the 2022 publication of its script book.