Reverse Shocks and The Optical Flash
There can be "reverse shocks", which propagate back into the shocked matter once it begins to encounter the interstellar medium. The twice-shocked material can produce a bright optical/UV flash, which has been seen in a few GRBs, though it appears not to be a common phenomenon.
Read more about this topic: Gamma-ray Burst Emission Mechanisms
Famous quotes containing the words reverse, shocks, optical and/or flash:
“They shall beat their swords into plowshares, and their spears into pruninghooks: nation shall not lift up sword against nation, neither shall they learn war any more.”
—Bible: Hebrew Isaiah, 2:4.
The words reappear in Micah 4:3, and the reverse injunction is made in Joel 3:10 (”Beat your plowshares into swords ...”)
“The end will come quickly, my love. There is a pain beyond pain, an agony so intense it shocks the mind into instant oblivion. We’ll find immortality together, for they’ll remember me through you.”
—Crane Wilbur (1889–1973)
“There is an optical illusion about every person we meet.”
—Ralph Waldo Emerson (1803–1882)
“The most welcome joke to me is the one that takes the place of a heavy, not altogether innocuous thought, at once a cautionary hint of the finger and a flash of the eye.”
—Friedrich Nietzsche (1844–1900)