Open AccessCORRELATION BETWEEN HARDNESS RATIO AND DURATION OF FERMI GAMMA-RAY BURSTS
Author(s) -
Fu-Wen Zhang
Publication year - 2013
Publication title -
international journal of modern physics conference series
Language(s) - English
Resource type - Journals
ISSN - 2010-1945
DOI - 10.1142/s2010194513011501
Subject(s) - gamma ray burst , astrophysics , physics , fermi gamma ray space telescope , spectral line , correlation , energy (signal processing) , positive correlation , power law , astronomy , statistics , medicine , mathematics , quantum mechanics , geometry
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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