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Gamma-ray burst captured in unprecedented detail

27 July 2017 Astronomy Now

Gamma-ray bursts are among the most energetic and explosive events in the universe. They are also short-lived, lasting from a few milliseconds to about a minute, making it tough for astronomers to observe a gamma-ray burst in detail. Using a wide array of ground- and space-based telescope observations, an international team constructed one of the most detailed descriptions of a gamma-ray burst to date.

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Fast radio bursts born in cosmic cataclysms

15 November 2016 Astronomy Now

Fast radio bursts (FRBs) were first discovered in 2007, and in the years since radio astronomers have detected a few dozen of these events. Researchers have found that these mysterious “cosmic whistles” can release a billion times more energy in gamma-rays than they do in radio waves, rivalling supernovae in their explosive power.

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Chandra X-ray Observatory finds evidence for violent stellar merger

16 July 2016 Astronomy Now

Gamma-ray bursts, or GRBs, are some of the most violent and energetic events in the universe. Although these events are the most luminous explosions astronomers can observe, a new study using NASA’s Chandra X-ray Observatory, NASA’s Swift satellite and other Earth-based telescopes suggests that scientists may be missing a majority of these powerful cosmic detonations.

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How black hole jets break out of their galaxies

18 June 2016 Astronomy Now

A computer simulation of the powerful jets generated by supermassive black holes at the centres of the largest galaxies explains why some burst forth as bright beacons visible across the universe, while others fall apart and never pierce the halo of the galaxy. A jet’s hot ionised gas is propelled by the twisting magnetic fields of the central rotating black hole.

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Shocks in a distant gamma-ray burst

15 September 2015 Astronomy Now

Gamma ray bursts (GRBs) — flashes of high-energy light occurring about once a day, randomly, from around the sky — are the brightest events in the known universe. While a burst is underway, it is many millions of times brighter than an entire galaxy. Astronomers are anxious to decipher their nature as their tremendous brightness opens windows into the young universe.