These phenomena show a delay between low-energy and high-energy phases known as spectral lag.
The largest known structure in the universe, the Hercules-Corona Borealis Great Wall, was mapped using these events. The Band function is used to describe the spectra of these objects, and their flux shows a four-part power law distribution with a blackbody tail. One device used to map these events contains the BAT and XRT instruments and is named for its very fast slew rate. These phenomena show a delay between low-energy and high-energy phases known as spectral lag. As these events slow down and fade, they exhibit a power-law decay in their afterglow due to a "jet break". One of these events occurring during the (*) Super Bowl nearly overloaded the EGRET instrument.  The Swift mission, BATSE mission and Compton observatory are used to detect them, which may have caused the Ordovician-Silurian extinction. The short-hard ones are believed to be caused by mergers of compact objects, and the collapsar and hypernova models are used to explain their more common long-soft variety. For 10 points, name these energetic events in astrophysics that are named for the high frequency radiation they emit.
The largest known structure in the universe, the Hercules-Corona Borealis Great Wall, was mapped using these events.
gamma ray bursts [or GRB]