Vigilar GSD leverages the network of ANetD IP speakers and displays, having built-in sensors and installed in numbers throughout a building, to detect and localize a gunshot then send an audio verification recording to a designated building administrator. Once a gunshot is verified, an administrator can take action including building lockdown and notification of law enforcement through a Vigilar GSD integration partner software such as InformaCast Fusion. Every second counts during an active shooter emergency. Vigilar GSD provides nearly 100% accuracy in the detection of a gunshot so as to eliminate guesswork and streamline the involvement of first responders, upon their arrival at the scene.