An article published in the journal “Nature Astronomy” reports the discovery of a candidate intermediate-mass black hole. A team of researchers studied a gravitational lens using detections of photons that were part of a gamma-ray burst to calculate the mass of the lens based on the delay caused by the deviation of the photons of its “echo”. The result is that the mass of the object acting as a gravitational lens was estimated to be about 55,000 times the Sun’s. The nature of the object is not certain but the analysis of the data clearly favors the hypothesis that it’s an intermediate-mass black hole, a type of black hole that is rare and, above all, very elusive.