Not sure who owns the map, I think there's a way to find out in my maps when you press the ... thingy in the top left.
I wasn't talking about the 2006 one, I think they did wail around 2015. I didn't know much about sirens back then, but I knew they set them off in a different tone. My mom even commented on it, thinking it was some different siren system. It was during a tornado warning, and it came after a 3 minute alert tone.