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What is Great GRB Wall?
We copied it from Wikipedia
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.