discussion, the fraction of the mass converted into electromagnetic radiation is negligible, unless the period $T$ is at the Planck scale, which probably means that collapse took place, and that the emitted radiation is not visible to distant observers.

As already mentioned, however, a more realistic estimate ought to treat relativistically the electromagnetic emission.

Eventually, another possibility, both more and less favorable, would be offered by a compact spinning concentrate of dark matter interposed to some distant source; spin and concentration apart, these objects exist and are revealed to us by gravitational lensing. Which results from the gravitational deflection of photons experimentally known since a century.

But if the source emits also charged particles, say electrons, sufficiently energetic to reach us within a reasonable delay after the $\gamma$ rays, their deflection ought to be modified by the magnetic field caused by the moment of our stellar object, due to Quantum Spacetime. A sort of QST - Northern Light phenomenon.

One might hope that this is a “more favorable" situation with respect to the one considered above because, while the energy emitted is proportional to the fourth power of the Planck length, the deviation we are mentioning now would be only 