L.-W. Jia and Y.-P. Qin 2005 ApJ 631 L25 doi:10.1086/496917
L.-W. Jia1,2 and Y.-P. Qin1,3
Show affiliationsThe FWHM of gamma-ray burst (GRB) pulses is known to be related to energy by a power law. We wonder if the power-law index α is related to the corresponding local pulse width FWHM0. Seven FRED (fast rise, exponential decay) pulse GRBs are employed to study this issue; six of them were interpreted recently by the relativistic curvature effect (the Doppler effect of fireballs), and the corresponding local pulses were intensely studied. A regression analysis shows an anticorrelation between log α and log FWHM0 with a slope of -0.37 ± 0.13. This suggests that, for the class of the GRB pulses that are the consequence of the curvature effect, the difference in the local pulse width might lead to a variation in the power-law index, in which the smaller the width, the larger the value of α. Since the number of sources employed in this analysis is small, our result is only a preliminary one that needs to be confirmed by larger samples.
Issue 1 (2005 September 20)
Received 2005 May 10, accepted for publication 2005 August 4
Published 2005 August 29
L.-W. Jia and Y.-P. Qin 2005 ApJ 631 L25
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S B Lobb et al 2009 J. Phys. A: Math. Theor. 42 472002
R J Baxter 2007 J. Phys. A: Math. Theor. 40 12577
M. Okabayashi et al 2009 Nucl. Fusion 49 125003
Chao-Jen Lai et al 2009 Phys. Med. Biol. 54 6691
James P Crawford 2003 Class. Quantum Grav. 20 2945
V Hutanu et al 2007 J. Phys. D: Appl. Phys. 40 4405
John F Federici et al 2002 Phys. Med. Biol. 47 3727