CMNS: GRB Captured in Unprecedented Detail

[bystander]

Gamma-ray Burst Captured in Unprecedented Detail
College of Computer, Mathematical, and Natural Sciences
University of Maryland, College Park | 2017 Jul 26

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UMD-led team uses data from multiple telescopes to address long-standing questions about the universe’s most powerful explosions

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. This has made 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 led by University of Maryland astronomers constructed one of the most detailed descriptions of a gamma-ray burst to date. The event, named GRB 160625B, revealed key details about the initial “prompt” phase of gamma-ray bursts and the evolution of the large jets of matter and energy that form as a result of the burst. ...

The group’s observations provide the first answers to some long-standing questions about how a gamma-ray burst evolves as the dying star collapses to become a black hole. First, the data suggest that the black hole produces a strong magnetic field that initially dominates the energy emission jets. Then, as the magnetic field breaks down, matter takes over and begins to dominate the jets. Most gamma-ray burst researchers thought that the jets were dominated by either matter or the magnetic field, but not both. The current results suggest that both factors play key roles. ...

Massive Star's Dying Blast Caught By Rapid-Response Telescopes
Arizona State University | 2017 Jul 26

A blast of gamma rays from space detected in June 2016 is helping astronomers resolve long-standing questions about the universe's most powerful explosions. ...

Significant and variable linear polarization during the prompt optical flash of GRB 160625B - E. Troja et al

• Nature (online 26 Jul 2017) DOI: 10.1038/nature23289

[MargaritaMc]

I'm hugely impressed by the rapid response, involving several countries and agencies, which enabled the observation of the burst.

https://asunow.asu.edu/20170726-discove ... telescopes
The gamma-ray blast on June 25, 2016, was detected by two NASA satellites that monitor the sky for such events, the Fermi Gamma-ray Space Telescope and the Swift Gamma-Ray Burst Mission.

The satellite observatories detected the burst of gamma rays, identified where in the sky it came from, and sent its celestial position within seconds to automated telescopes on the ground.

The MASTER-IRC telescope at the Teide Observatory in the Canary Islands observed it first, within a minute of the satellite notification. The telescope is part of Russia's MASTER network of robotic telescopes at the Teide Observatory. It made optical light observations while the initial phase was still active, gathering data on the amount of polarized optical light relative to the total light produced.

After the sun set over this facility eight and a half hours later, the RATIR camera in which ASU is involved began observing. RATIR stands for Reionization And Transients InfraRed camera; it is mounted on a 1.5-meter (60-inch) robotically controlled telescope located on San Pedro Mártir Peak, at Mexico's National Astronomical Observatory in Baja California.

[...] In the case of the June 2016 blast, the scientists were able to measure polarization using MASTER within minutes, an unprecedented early discovery.