Los Alamos National Laboratory RAPTOR telescopes in New Mexico and Hawaii received a very bright cosmic birth announcement for a black hole on April 27th.
The RAPTOR (RAPid Telescopes for Optical Response) system is a network of small robotic observatories that scan the skies for optical anomalies such as flashes emanating from a star in its death throes as it collapses and becomes a black hole - an object so dense that not even light can escape its gravity field.
This birth announcement arrived from the constellation Leo in the form of an exceptionally bright flash of visible light that accompanied a powerful burst of cosmic gamma-ray emissions.
What made such an extremely rare event even more spectacular for scientists, however, is that, in addition to the RAPTOR sighting, it was witnessed by an armada of instruments—including gamma-ray and X-ray detectors aboard NASA’s Fermi, NuSTAR and Swift satellites.
While the NASA instruments recorded some of the highest-energy gamma-ray bursts ever measured from such an event, RAPTOR noticed that the massive and violent transformation of a star into a black hole yielded a lingering “afterglow” that faded in lock-step with the highest energy gamma-rays.
"This was the burst of the century," said Los Alamos co-author James Wren. "It’s the biggest, brightest one to happen in at least 20 years, and maybe even longer than that."
"This afterglow is interesting to see," said paper co-author Przemek Wozniak of Los Alamos’s Intelligence and Space Research Division. "We normally see a flash associated with the beginning of an event, analogous to the bright flash that you would see coinciding with the explosion of a firecracker. This afterglow may be somewhat analogous to the embers that you might be able to see lingering after your firecracker has exploded. It is the link between the optical phenomenon and the gamma-rays that we haven’t seen before, and that’s what makes this display extremely exciting."
All things considered, the event was among the brightest and most energetic of its type ever witnessed.