A microshot from FRB 20220912A \citep{H23} satisfies the uncertainty relation ΔωΔt≥1 by a factor of only ⪅3. A Crab pulsar nanoshot \citep{HE07} exceeds this bound by a similar factor. The number of orthogonal plasma modes contributing to the coherent radiation is also ≈ΔωΔt, placing constraints on their excitation and growth.
@article{arxiv.2310.06173,
title = {Radiation Modes in FRB 20220912A Microshots and a Crab PSR nanoshot},
author = {J. I. Katz},
journal= {arXiv preprint arXiv:2310.06173},
year = {2023}
}