Trumbull Fire Ground

I've had the scanner on for a good portion of the day and I've been hearing a brief buzzing sound on 460.6375 all day long. There hasn't been any other FD activity and either side of the buzzing sound on this frequency so it doesn't seem related to anything. Any ideas what this is?

not sure if it is any help town of enfield runs there ems on that ch it probably doesn’t make it down that far they use 186.2 for pl

The 3 Trumbull fire ground channels are-

Trumbull Center- 453.3375
Long Hill- 465.6375
Nichols- 458.8875

I had the freq above in my HP-1 as fire ground. I'll have to double check some things. Thanks