Distributions of the hardness ratio of short and long gamma-ray bursts in different time intervals within the first two seconds

In this paper we present a Multi-Scale Correlation Analysis (MSCA) of the light curves of gamma-ray bursts recorded in different energy ranges. This analysis allows us to identify time intervals where emission variability can be reduced to a single physical parameter and can therefore be robustly attributed to a single physical emitter. The properties of these intervals can then be investigated separately, and the spectral properties of individual emitters can be analysed. The signatures of hidden dynamical relations between individual emitters are also discussed.

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Swift-BAT results on the prompt emission of short bursts

Philosophical Transactions of The Royal Society A Mathematical Physical and Engineering Sciences ◽

10.1098/rsta.2006.1967 ◽

2007 ◽

Vol 365 (1854) ◽

pp. 1281-1291 ◽

Cited By ~ 6

Author(s):

Scott D Barthelmy

Keyword(s):

Gamma Ray ◽

Gamma Ray Bursts ◽

Extended Phase ◽

Hardness Ratio ◽

Prompt Emission ◽

Extended Emission

This is a brief review of short hard bursts (SHBs) from previous missions and from Swift-BAT; in particular, a review of the developing class of gamma-ray bursts which are similar to SHBs in that they have the short hard initial spike (0.1 to a few seconds), but that they also have a long extended phase of soft emission (50–200 s). Further, we suggest that a class of events discovered by Horvath in the T90 versus hardness ratio plane is this SHB with extended emission.

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Analysis of the Duration–Hardness Ratio Plane of Gamma-Ray Bursts Using Skewed Distributions

The Astrophysical Journal ◽

10.3847/1538-4357/aaf1c5 ◽

2019 ◽

Vol 870 (2) ◽

pp. 105 ◽

Cited By ~ 5

Author(s):

Mariusz Tarnopolski

Keyword(s):

Gamma Ray ◽

Gamma Ray Bursts ◽

Skewed Distributions ◽

Hardness Ratio

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CORRELATION BETWEEN HARDNESS RATIO AND DURATION OF FERMI GAMMA-RAY BURSTS

International Journal of Modern Physics Conference Series ◽

10.1142/s2010194513011501 ◽

2013 ◽

Vol 23 ◽

pp. 298-300

Author(s):

FU-WEN ZHANG

Keyword(s):

Statistical Analysis ◽

Power Law ◽

Gamma Ray ◽

Gamma Ray Bursts ◽

Spectral Shape ◽

Energy Bands ◽

Hardness Ratio

Using the latest gamma-ray bursts (GRB) observed by Fermi-GBM, we perform a statistical analysis of the relation between hardness ratio (HR) and duration (ΔT) of GRBs, and find that HR and ΔT are still anti-correlated. we also find that this correlation strongly depends upon the spectral shape of GRBs and energy bands, and the bursts with the curved spectra in the typical BATSE energy bands show a tighter anti-correlation than those with the power-law spectra in the typical BAT energy bands. This might explain why the HR – ΔT correlation is not evident for Swift-BAT GRB sample as well as other GRB sample detected by instruments with a narrower/softer energy bandpass such as HETE-2.

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