A star runs out of fuel and rapidly collapses under its own gravity. According to classical ideas, it collapses into a point of infinite density — a singularity. But what if nature abhors infinities? In models of regular black holes, instead of a singularity, a dense core of unknown matter forms at the center. This matter did not exist in the star initially: it is born right during the collapse.

The authors traced how ordinary stellar matter transforms into a 'patch' for the singularity. They used the Dymnikova–Hayward–Bardeen model and calculated how much energy goes into radiation when new matter is born. It turns out that this process should produce a powerful flash of electromagnetic radiation — exactly like a gamma-ray burst.

But the most intriguing part is the comparison with observations. For the calculated flash to match real gamma-ray bursts, the 'patch' at the center must be very small. So small that from a distance, such a black hole is almost indistinguishable from an ordinary Schwarzschild one. Nature seems to hide its secrets behind nearly perfect camouflage. Thus, the birth of a regular black hole becomes a natural mechanism for gamma-ray bursts, while the holes themselves remain almost exactly as described by Karl Schwarzschild.