The NQ2-NQ4 GRB is the name of a massive density region in the sky .
The NQ2-NQ4 GRB overdensity 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 high concentration of similarly distanced GRBs than the expected average distribution .
Hercules�Corona Borealis Great Wall