scholarly journals Search for Relativistic Curvature Effects in Gamma‐Ray Burst Pulses

2003 ◽  
Vol 596 (1) ◽  
pp. 389-400 ◽  
Author(s):  
Dan Kocevski ◽  
Felix Ryde ◽  
Edison Liang
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Burst ◽  
Curvature Effects

scholarly journals Curvature Effects in Gamma‐Ray Burst Colliding Shells

2004 ◽  
Vol 614 (1) ◽  
pp. 284-292 ◽  
Author(s):  
Charles D. Dermer
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Burst ◽  
Curvature Effects

scholarly journals The First Pulse of the Extremely Bright GRB 130427A: A Test Lab for Synchrotron Shocks

Science ◽  
2013 ◽  
Vol 343 (6166) ◽  
pp. 51-54 ◽  
Author(s):  
R. Preece ◽  
J. Michael Burgess ◽  
A. von Kienlin ◽  
P. N. Bhat ◽  
M. S. Briggs ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
Power Law ◽  
Time Resolution ◽  
Gamma Ray ◽  
Strongly Correlated ◽  
Initial Pulse ◽  
Gamma Ray Burst ◽  
Curvature Effects ◽  
Peak Energy ◽  
Fine Time

Gamma-ray burst (GRB) 130427A is one of the most energetic GRBs ever observed. The initial pulse up to 2.5 seconds is possibly the brightest well-isolated pulse observed to date. A fine time resolution spectral analysis shows power-law decays of the peak energy from the onset of the pulse, consistent with models of internal synchrotron shock pulses. However, a strongly correlated power-law behavior is observed between the luminosity and the spectral peak energy that is inconsistent with curvature effects arising in the relativistic outflow. It is difficult for any of the existing models to account for all of the observed spectral and temporal behaviors simultaneously.

scholarly journals Magnetohydrodynamic simulations of gamma-ray burst jets: Beyond the progenitor star

New Astronomy ◽  
2010 ◽  
Vol 15 (8) ◽  
pp. 749-754 ◽  
Author(s):  
Alexander Tchekhovskoy ◽  
Ramesh Narayan ◽  
Jonathan C. McKinney
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Burst ◽  
Magnetohydrodynamic Simulations

scholarly journals Statistical Properties of Gamma-Ray Burst Host Galaxies

2012 ◽  
Vol 8 (S292) ◽  
pp. 190-190
Author(s):  
J. M. Chen ◽  
L. W. Jia ◽  
E. W. Liang
Keyword(s):  
Gamma Ray ◽  
Formation Rate ◽  
Neutral Hydrogen ◽  
Statistical Properties ◽  
Host Galaxy ◽  
Host Galaxies ◽  
Gamma Ray Burst ◽  
Star Forming ◽  
Hydrogen Column Density ◽  
Linear Fit

AbstractGRBs are the most luminous events in the Universe. They are detectable from local to high-z universe and may serve as probes for high-z galaxies (e.g., Savaglio et al. 2009; Kewley & Dopita 2002). We compile the observations for 61 GRB host galaxies from literature. Their redshifts range from 0.0085 to 6.295. We present the statistical properties of the GRB host galaxies, including the stellar mass (M*), star-forming rate (SFR), metallicity (Z), extinction (AV), and neutral hydrogen column density (NH). We explore possible correlations among the properties of gamma-ray burst host galaxies and their cosmic evolution with observations of 61 GRB host galaxies. Our results are shown in Figure 1. A clear Z-M* relation is found in our sample, which is Z ~ M0.4. The host galaxies of local GRBs with detection of accompanied supernovae also share the same relation with high-z GRB host galaxies. A trend that a more massive host galaxy tends to have a higher star-formation rate is found. The best linear fit gives a tentative relation, i.e, SFR ~ M0.75. No any correlation is found between AV and NH. A GRB host galaxy at a higher redshift also tends to have a higher SFR. Even in the same redshift, the SFR may vary over three orders of magnitude. The metallicity of the GRB host galaxies is statistically higher than that of the QSO DLAs. The full version of our results please refer to Chen et al. (2012).

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