Average Emissivity Curve of BATSE Gamma-Ray Bursts with Different Intensities

Details Average Emissivity Curve of BATSE Gamma-Ray Bursts with Different Intensities Average Emissivity Curve of BATSE Gamma-Ray Bursts with Different Intensities

1999-06-18

arxiv.org/abs/astro-ph/9906307v2

Astronomy and Astrophysics

Astrophysics

21 pages, 3 figures. Accepted to ApJ

Scientific paper

10.1086/307749

Six intensity groups with ~150 BATSE gamma-ray bursts each are compared using average emissivity curves. Time-stretch factors for each of the dimmer groups are estimated with respect to the brightest group, which serves as the reference, taking into account the systematics of counts-produced noise effects and choice statistics. A stretching/intensity anti-correlation is found with good statistical significance during the average back slopes of bursts. A stretch factor ~2 is found between the 150 dimmest bursts, with peak flux <0.45ph cm^{-2} s^{-1}, and the 147 brightest bursts, with peak flux >4.1 ph cm^{-2} s^{-1}. On the other hand, while a trend of increasing stretching factor may exist for rise fronts for burst with decreasing peak flux from >4.1 ph cm^{-2} s^{-1} down to 0.7 ph cm^{-2} s^{-1}, the magnitude of the stretching factor is less than ~ 1.4 and is therefore inconsistent with stretching factor of back slope.

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