As others have said, might just be someone practicing.
Next time you hear it, as others have said, just go to
Live Flight Tracker - Real-Time Flight Tracker Map | Flightradar24
The world’s most popular flight tracker. Track planes in real-time on our flight tracker map and get up-to-date flight status & airport information.www.flightradar24.com
and find your area. If the plane is squawking a code, it'll show up and should show you some info.
I checked out that website, and it works pretty slick, even on my phone. It will be interesting to see if my local traffic shows up.