Huge energies released at distant sources
appear only faintly at our radio antennas.
At the source, an FRB could release as much energy in a millisecond
than the sun releases in 80 years.
At our antennas, because of its great distance (billions of light years),
the same FRB could appear to us a thousand times weaker than a cell phone on the moon.
See also in The book of science:
Readings in wikipedia: