CORRELATION BETWEEN THE ISOTROPIC ENERGY AND THE PEAK ENERGY AT ZERO FLUENCE FOR THE INDIVIDUAL PULSES OF GAMMA-RAY BURSTS: TOWARD A UNIVERSAL PHYSICAL CORRELATION FOR THE PROMPT EMISSION

We find a strong correlation between the peak energy at zero fluence (E sub(peak, 0)) and the isotropic energy (E sub( gamma , iso)) of the 22 pulses of nine gamma-ray bursts (GRBs) detected by the Fermi satellite. The correlation holds for the individual pulses of each GRB, which shows the reality...

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Bibliographic Details
Published in:The Astrophysical journal 2012-04, Vol.749 (2), p.1-5
Main Authors: BASAK, Rupal, RAO, A. R
Format: Article
Language:English
Subjects:
Accounting
Astronomy
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Correlation
Correlation analysis
COSMIC GAMMA BURSTS
DATA ANALYSIS
Earth, ocean, space
Emission
Exact sciences and technology
Fluence
Gamma ray bursts
PHOTON EMISSION
PULSES
Satellites
Spectra
Time measurements
TIME RESOLUTION
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Summary:We find a strong correlation between the peak energy at zero fluence (E sub(peak, 0)) and the isotropic energy (E sub( gamma , iso)) of the 22 pulses of nine gamma-ray bursts (GRBs) detected by the Fermi satellite. The correlation holds for the individual pulses of each GRB, which shows the reality of the correlation. The derived correlation (Spearman correlation coefficient, r, which is 0.96) is much stronger compared to the correlations using E sub(peak) (in place of E sub(peak, 0)) determined from the time-integrated spectrum (r = 0.8), the time-resolved spectrum without accounting for broad pulse structures (r = 0.37), or the pulsewise spectrum (r = 0.89). Though the improvement in the E sub(peak)-E sub( gamma , iso) relation (the Amati relation) for a pulsewise analysis is known earlier, this is the first time a parameter derived from a joint spectral and timing fit to the data is shown to improve the correlation. We suggest that E sub(peak, 0), rather than E sub(peak), is intrinsic to a GRB pulse and a natural choice as the parameter in pulsewise correlation studies.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/749/2/132