page_title: Hercules–Corona Borealis Great Wall
hierarchical_section_title: Hercules–Corona Borealis Great Wall
caption_attribution_description: English: Gamma-ray bursts (GRBs) are powerful flashes of energetic gamma-rays lasting from less than a second to several minutes. They release a tremendous amount of energy in this short time making them the most powerful events in the Universe. They are thought to be mostly associated with the explosion of stars that collapse into black holes. In the explosion, two jets of very fast-moving material are ejected, as depicted in this artist’s illustration. If a jet happens to be aimed at Earth, we see a brief but powerful gamma-ray burst. Français&#160;: Les sursauts gamma (GRB) sont des éclairs puissants de rayons gamma énergétiques qui durent de moins d'une seconde à plusieurs minutes. Dans ce court laps de temps ils libèrent une énorme quantité d'énergie ce qui les rend les événements les plus puissants de l'Univers. On pense qu'ils sont principalement associés à l'explosion d'étoiles qui s'effondrent dans des trous noirs. Lors de l'explosion, deux jets de matériaux très rapides sont éjectés, comme le montre cette image d'artiste. Si un jet se trouvait être dirigé vers la Terre, nous verrions une brève mais puissante explosion de rayons gamma.
context_page_description: Hercules–Corona Borealis Great Wall or the Great GRB Wall is the largest known structure in the observable universe, measuring approximately 10 billion light years in length. This massive superstructure is a region of the sky seen in the data set mapping of gamma-ray bursts that has been found to have an unusually higher concentration of similarly distanced GRBs than the expected average distribution. It was discovered in early November 2013 by a team of American and Hungarian astronomers led by István Horváth, Jon Hakkila and Zsolt Bagoly while analyzing data from the Swift Gamma-Ray Burst Mission, together with other data from ground-based telescopes. It is the largest known formation in the universe, exceeding the size of the prior Huge-LQG by about two times.
  The overdensity lies at the Second, Third and Fourth Galactic Quadrants of the sky. Thus, it lies in the Northern Hemisphere, centered on the border of the constellations Draco and Hercules. The entire clustering consists of around 19 GRBs with the redshift ranges between 1.6 and 2.1.
context_section_description: Hercules–Corona Borealis Great Wall or the Great GRB Wall is the largest known structure in the observable universe, measuring approximately 10 billion light years in length (for perspective, the observable universe is about 93 billion light years in diameter). This massive superstructure is a region of the sky seen in the data set mapping of gamma-ray bursts (GRBs) that has been found to have an unusually higher concentration of similarly distanced GRBs than the expected average distribution. It was discovered in early November 2013 by a team of American and Hungarian astronomers led by István Horváth, Jon Hakkila and Zsolt Bagoly while analyzing data from the Swift Gamma-Ray Burst Mission, together with other data from ground-based telescopes. It is the largest known formation in the universe, exceeding the size of the prior Huge-LQG by about two times.
  The overdensity lies at the Second, Third and Fourth Galactic Quadrants (NQ2, NQ3 and NQ4) of the sky. Thus, it lies in the Northern Hemisphere, centered on the border of the constellations Draco and Hercules. The entire clustering consists of around 19 GRBs with the redshift ranges between 1.6 and 2.1.
  Typically, the distribution of GRBs in the universe appears in the sets of less than the 2σ distribution, or with less than two GRBs in the average data of the point-radius system. One possible explanation of this concentration is the Hercules–Corona Borealis Great Wall. The wall has a mean size in excess of 2 billion to 3 billion parsecs (6 to 10 billion light-years). Such a supercluster can explain the significant distribution of GRBs because of its tie to star formation. The Hercules–Corona Borealis Great Wall is now the largest known structure in the observable universe.
  Doubt has been placed on the existence of the structure in other studies, positing that the structure was found through biases in certain statistical tests and not considering the full effects of extinction.
caption: A gamma-ray burst, like the ones used to map the wall
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