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Black hole birth captured: Biggest, brightest to happen in at least 20 years

Date:
November 21, 2013
Source:
DOE/Los Alamos National Laboratory
Summary:
Intelligent telescopes designed by Los Alamos National Laboratory got a front row seat recently for an unusual birth. "This was the burst of the century," said James Wren, one of the scientists involved in the discovery. "It's the biggest, brightest one to happen in at least 20 years, and maybe even longer than that."

An artist's conception of the processes by which a star collapses and becomes a black hole, releasing high-energy gamma rays and X-rays, as well as visible light, in the process. An armada of instruments detected the brightest recorded event of this type occurring on April 27, 2013. Los Alamos National Laboratory's RAPTOR (RAPid Telescopes for Optical Response) system saw the visual flash as it occurred in the constellation Leo and lingered for more than two minutes. RAPTOR is an intelligent visual system that scans the skies for optical anomalies and zeroes in on them when it detects them. NASA satellites detected gamma-ray bursts that corresponded perfectly with the optical signature. The event provides astrophysicists with a treasure trove of data that they can use to enhance their understanding of our universe and the cosmic processes that occur within it.
Credit: NASA

Intelligent telescopes designed by Los Alamos National Laboratory got a front row seat recently for an unusual birth.

"Los Alamos' RAPTOR telescopes in New Mexico and Hawaii received a very bright cosmic birth announcement for a black hole on April 27," said astrophysicist Tom Vestrand, lead author of a paper appearing today in the journal Science that highlights the unusual event.

"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."

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 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.

"This was a Rosetta-Stone event that illuminates so many things -- literally," Vestrand said. "We were very fortunate to have all of the NASA and ground-based instruments seeing it at the same time. We had all the assets in place to collect a very detailed data set. These are data that astrophysicists will be looking at for a long time to come because we have a detailed record of the event as it unfolded."

Already the event, labeled GRB 130427A by astrophysicists, is testing some long-held assumptions about the nature of the universe. For example, scientists recorded energy levels for gamma rays that are higher than what some researchers thought theoretically possible. This revelation may require physicists to modify existing theories about radiation. No doubt, the data set could yield more surprises in the future, Vestrand said.


Story Source:

The above story is based on materials provided by DOE/Los Alamos National Laboratory. Note: Materials may be edited for content and length.


Journal Reference:

  1. W. T. Vestrand, J. A. Wren, A. Panaitescu, P. R. Wozniak, H. Davis, D. M. Palmer, G. Vianello, N. Omodei, S. Xiong, M. S. Briggs, M. Elphick, W. Paciesas, and W. Rosing. The Bright Optical Flash and Afterglow from the Gamma-Ray Burst GRB 130427A. Science, 21 November 2013 DOI: 10.1126/science.1242316

Cite This Page:

DOE/Los Alamos National Laboratory. "Black hole birth captured: Biggest, brightest to happen in at least 20 years." ScienceDaily. ScienceDaily, 21 November 2013. <www.sciencedaily.com/releases/2013/11/131121142349.htm>.
DOE/Los Alamos National Laboratory. (2013, November 21). Black hole birth captured: Biggest, brightest to happen in at least 20 years. ScienceDaily. Retrieved September 22, 2014 from www.sciencedaily.com/releases/2013/11/131121142349.htm
DOE/Los Alamos National Laboratory. "Black hole birth captured: Biggest, brightest to happen in at least 20 years." ScienceDaily. www.sciencedaily.com/releases/2013/11/131121142349.htm (accessed September 22, 2014).

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