Have they detected electromagnetic energy beyond the gamma spectrum?

Have they detected electromagnetic energy beyond the gamma spectrum?
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The answer rests on technical definitions, but I believe both radio and gamma are defined as EM beyond a certain frequency, with no limits on the extreme ends. So there’s no such thing. The spectra of EM radiation are just ranges of frequency values, and the end categories have no end value. But the frequency value of EM can be anything, in theory and perhaps even in practice. In practice, there are some limits to what there is any point in trying to use or measure, however, and whether there is any meaningful information to detect by trying. Unless one is talking about the lowest used/defined radio band. I think the lowest ELF band is defined as something like 3 Hz.
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