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gamma-ray bursts

This tag is associated with 16 posts

Can gamma ray bursts be used as standard candles?

Some GRB-SNe pairs show interesting correlations across their light curves.

UR #11: Our Galactic Magnetic Field and Stellar Autopsies

This month’s undergraduate research post features pulsars as a probe of our galaxy’s magnetic field, and the possibility of asymmetries in supernovae associated with gamma-ray bursts.

Probing high redshifts with gamma-ray bursts

Gamma-ray bursts are the most energetic explosions in the Universe. Today, we discuss how to use one GRB as a beacon to study the properties of a high redshift galaxy, the composition of the gas in the intergalactic medium at high redshift and the formation of dust in the Universe.

Dangers to Life from GRBs

Looking for something fun to consider today? Try this on for size: what happens to life on Earth if a gamma-ray burst points at us from within our own galaxy?

A tale of a kilonova

Short gamma-ray bursts, extremely energetic explosions in the Universe, might be caused by the merger of two compact objects. In the two papers we discuss today, the authors test this scenario by looking for light emitted still a few days after the explosion.

W49B: A Jet-Driven Supernova?

The authors discuss the possibility that the strangely-shaped supernova remnant W49B was created by a core-collapse supernova that formed strong bipolar jets instead of a spherical shockwave.

2012: My Favorite Doomsday Scenarios

Let’s be serious for a moment: nothing dire is going to happen on December 21st. Rest easy. But in celebration I’ve decided to count down my top five favorite astronomical doomsday scenarios, ordered from most to least plausible.

Disappearing act: how gamma-ray bursts help us find massive reservoirs of neutral hydrogen

Using a combination of spectra from gamma-ray burst afterglows and photometry and spectroscopy of nearby objects, astronomers have found the galaxy counterpart to at least one high-redshift absorption system, bumping the total number of such galaxies from nine to ten.

Are Short Gamma-Ray Bursts Jets?

Astronomers detect a jet break in the X-ray afterglow of short GRB 111020A.

The Christmas Burst: GRB 101225A Explained?

Last year on Christmas day, scientists observed a unique gamma-ray burst, GRB 101225A. Two interesting and very different models have developed for the ‘Christmas burst:’ a tidal disruption of a comet by a neutron star somewhere in our Galaxy, or a neutron star consuming its companion star over 5 billion light years away.

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