Energy Injection Episodes in Gamma-Ray Bursts: The Light Curves and Polarization Properties of GRB 021004

2004 ◽  
Vol 615 (2) ◽  
pp. L77-L80 ◽  
Author(s):  
G. Björnsson ◽  
E. H. Gudmundsson ◽  
G. Jóhannesson
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Light Curves

Can Precessing Jets Explain the Light Curves of Gamma‐Ray Bursts?

1999 ◽  
Vol 520 (2) ◽  
pp. 666-679 ◽  
Author(s):  
Simon F. Portegies Zwart ◽  
Chang‐Hwan Lee ◽  
Hyun Kyu Lee
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Light Curves

scholarly journals Constraints on the circumburst environments of short gamma-ray bursts

2020 ◽  
Vol 495 (4) ◽  
pp. 4782-4799 ◽  
Author(s):  
Brendan O’Connor ◽  
Paz Beniamini ◽  
Chryssa Kouveliotou
Keyword(s):  
Gamma Ray ◽  
Galactic Halo ◽  
Gamma Ray Bursts ◽  
Light Curves ◽  
Host Galaxy ◽  
Host Galaxies ◽  
Binary Neutron Star ◽  
Range Of Values ◽  
Short Grbs

ABSTRACT Observational follow up of well localized short gamma-ray bursts (SGRBs) has left $20\!-\!30{{\ \rm per\ cent}}$ of the population without a coincident host galaxy association to deep optical and NIR limits (≳26 mag). These SGRBs have been classified as observationally hostless due to their lack of strong host associations. It has been argued that these hostless SGRBs could be an indication of the large distances traversed by the binary neutron star system (due to natal kicks) between its formation and its merger (leading to an SGRB). The distances of GRBs from their host galaxies can be indirectly probed by the surrounding circumburst densities. We show that a lower limit on those densities can be obtained from early afterglow light curves. We find that ${\lesssim}16{{\ \rm per\ cent}}$ of short GRBs in our sample took place at densities ≲10−4 cm−3. These densities represent the expected range of values at distances greater than the host galaxy’s virial radii. We find that out of the five SGRBs in our sample that have been found to be observationally hostless, none are consistent with having occurred beyond the virial radius of their birth galaxies. This implies one of two scenarios. Either these observationally hostless SGRBs occurred outside of the half-light radius of their host galaxy, but well within the galactic halo, or in host galaxies at moderate to high redshifts (z ≳ 2) that were missed by follow-up observations.

Precursors of short gamma-ray bursts detected by the INTEGRAL observatory

2018 ◽  
Vol 27 (10) ◽  
pp. 1844013 ◽  
Author(s):  
Pavel Minaev ◽  
Alexei Pozanenko ◽  
Sergei Molkov
Keyword(s):  
Statistical Analysis ◽  
Light Curve ◽  
Relative Intensity ◽  
Gamma Ray ◽  
Convincing Evidence ◽  
Gamma Ray Bursts ◽  
Light Curves ◽  
Upper Limits ◽  
Short Grbs

We have analyzed the light curves of 527 short gamma-ray bursts (GRBs) registered by the SPI-ACS, SPI and IBIS/ISGRI experiments of INTEGRAL observatory totally to search for precursors. Both the light curves of each 527 individual burst and the averaged light curve of 372 brightest SPI-ACS bursts have been analyzed. In a few cases, we have found and investigated precursor candidates using SPI-ACS, SPI and IBIS/ISGRI of INTEGRAL, GBM and LAT of Fermi data. No convincing evidence for the existence of precursors of short GRBs has been found. A statistical analysis of the averaged light curve for the sample of brightest short bursts has revealed no regular precursor. Upper limits for the relative intensity of precursors have been estimated. We show that the fraction of short GRBs with precursors is less than 0.4% of all short bursts, detected by INTEGRAL.

X‐Ray Light Curves of Gamma‐Ray Bursts Detected with the All‐Sky Monitor on RXTE

2002 ◽  
Vol 141 (2) ◽  
pp. 415-428 ◽  
Author(s):  
D. A. Smith ◽  
A. Levine ◽  
H. Bradt ◽  
K. Hurley ◽  
M. Feroci ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Light Curves ◽  
X Ray ◽  
Sky Monitor

scholarly journals Clustering of LAT light curves: a clue to the origin of high-energy emission in gamma-ray bursts

2014 ◽  
Vol 443 (4) ◽  
pp. 3578-3585 ◽  
Author(s):  
L. Nava ◽  
G. Vianello ◽  
N. Omodei ◽  
G. Ghisellini ◽  
G. Ghirlanda ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Gamma Ray Bursts ◽  
Light Curves ◽  
Energy Emission ◽  
High Energy Emission

THE CASE FOR NON-BARYONIC ENERGY AS THE PRIMARY OUTPUT OF GRBs

2008 ◽  
Vol 17 (09) ◽  
pp. 1333-1341
Author(s):  
D. EICHLER
Keyword(s):  
Kinetic Energy ◽  
Photon Energy ◽  
Radiation Pressure ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Light Curves ◽  
Poynting Flux ◽  
Primary Output ◽  
Primary Form

The evidence is reviewed that the primary form of energy that escapes to infinity from gamma-ray bursts (GRBs) is gamma-rays, and/or Poynting flux, and that the kinetic energy in ultrarelativistic baryons is a secondary component resulting from acceleration of baryons by radiation pressure near or beyond the photosphere. This could account for several observed characteristics of observed GRB spectra and light curves, such as the typical peak photon energy, the correlation of this peak with apparent GRB energy, and the profiles and spectral lagging of GRB subpulses.

scholarly journals Afterglow light curves from magnetized GRB flows

2010 ◽  
Vol 6 (S275) ◽  
pp. 358-362
Author(s):  
Petar Mimica ◽  
Dimitrios Giannios ◽  
Miguel Ángel Aloy
Keyword(s):  
Magnetic Field ◽  
Radiative Transfer ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Light Curves ◽  
Reverse Shock ◽  
The Magnetic Field

AbstractUsing the RMHD code MRGENESIS and the radiative transfer code SPEV we compute multiwavelength afterglow light curves of magnetized ejecta of gamma-ray bursts interacting with a uniform circumburst medium. We are interested in the emission from the reverse shock when ejecta magnetization varies from σ0 = 0 to σ0 = 1. For typical parameters of the ejecta, the emission from the reverse shock peaks for magnetization σ0 ~ 0.01 − 0.1, and is suppressed for higher σ0. We fit the early afterglow light curves of GRB 990123 and 090102 and discuss the possible magnetization of the outflows of these bursts. Finally we discuss the amount energy left in the magnetic field which is available for dissipation at later afterglow stages.

scholarly journals A model of the light curves of gamma-ray bursts

2007 ◽  
Vol 468 (2) ◽  
pp. 563-569 ◽  
Author(s):  
W. H. Lei ◽  
D. X. Wang ◽  
B. P. Gong ◽  
C. Y. Huang
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Light Curves
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