scholarly journals The prompt-afterglow connection in gamma-ray bursts: a comprehensive statistical analysis of Swift X-ray light curves

2012 ◽  
Vol 428 (1) ◽  
pp. 729-742 ◽  
Author(s):  
R. Margutti ◽  
E. Zaninoni ◽  
M. G. Bernardini ◽  
G. Chincarini ◽  
F. Pasotti ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Light Curves ◽  
X Ray

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 X-ray plateaus in gamma-ray bursts’ light curves from jets viewed slightly off-axis

2020 ◽  
Vol 492 (2) ◽  
pp. 2847-2857 ◽  
Author(s):  
Paz Beniamini ◽  
Raphaël Duque ◽  
Frédéric Daigne ◽  
Robert Mochkovitch
Keyword(s):  
Gamma Ray ◽  
Large Fraction ◽  
Gamma Ray Bursts ◽  
Point Of View ◽  
Light Curves ◽  
Late Time ◽  
X Ray ◽  
Narrow Region ◽  
Central Engine ◽  
Γ Rays

ABSTRACT Using multiple observational arguments, recent work has shown that cosmological gamma-ray bursts (GRBs) are typically viewed at angles within, or close to the cores of their relativistic jets. One of those arguments relied on the lack of tens-of-days-long periods of very shallow evolution that would be seen in the afterglow light curves of GRBs viewed at large angles. Motivated by these results, we consider that GRBs efficiently produce γ-rays only within a narrow region around the core. We show that, on these near-core lines of sight, structured jets naturally produce shallow phases in the X-ray afterglow of GRBs. These plateaus would be seen by a large fraction of observers and would last between 102–105 s. They naturally reproduce the observed distributions of time-scales and luminosities as well as the intercorrelations between plateau duration, plateau luminosity, and prompt γ-ray energy. An advantage of this interpretation is that it involves no late-time energy injection which would be both challenging from the point of view of the central engine and, as we show here, less natural given the observed correlations between plateau and prompt properties.

scholarly journals Indication of Two Classes in the Swift Short Gamma-Ray Bursts from the XRT X-Ray Afterglow Light Curves

2009 ◽  
Author(s):  
T. Sakamoto ◽  
N. Gehrels ◽  
Charles Meegan ◽  
Chryssa Kouveliotou ◽  
Neil Gehrels
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Light Curves ◽  
X Ray

scholarly journals UNDERLYING GLOBAL FEATURES OF THE X-RAY LIGHT CURVES OF SWIFT GAMMA-RAY BURSTS

2010 ◽  
Vol 719 (2) ◽  
pp. L172-L176 ◽  
Author(s):  
Lang Shao ◽  
Yi-Zhong Fan ◽  
Da-Ming Wei
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Light Curves ◽  
Global Features ◽  
X Ray

scholarly journals Slow and fast components in the X-ray light curves of gamma-ray bursts

2006 ◽  
Vol 447 (2) ◽  
pp. 499-513 ◽  
Author(s):  
L. Vetere ◽  
E. Massaro ◽  
E. Costa ◽  
P. Soffitta ◽  
G. Ventura
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Light Curves ◽  
X Ray

scholarly journals Inhomogeneities in the light curves of gamma-ray bursts afterglow

2018 ◽  
Vol 27 (10) ◽  
pp. 1844012
Author(s):  
Elena Mazaeva ◽  
Alexei Pozanenko ◽  
Pavel Minaev
Keyword(s):  
Light Curve ◽  
Power Law ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Light Curves ◽  
Peak Time ◽  
Gamma Ray Burst ◽  
X Ray

We discuss the inhomogeneous behavior of gamma-ray burst afterglow light curves in optic. We use well-sampled light curves based on mostly our own observations to find and identify deviations (inhomogeneities) from broken power law. By the inhomogeneous behavior we mean flashes, bumps, slow deviations from power law (wiggles) in a light curve. In particular we report parameters of broken power law, describe phenomenology, compare optical light curves with X-ray ones and classify the inhomogeneities. We show that the duration of the inhomogeneities correlates with their peak time relative to gamma-ray burst (GRB) trigger and the correlation is the same for all types of inhomogeneities.

Sign in / Sign up

Export Citation Format

Share Document