Correlations of Gamma-Ray Burst Morphology and The Internal Luminosity Function

Details Correlations of Gamma-Ray Burst Morphology and The Internal Luminosity Function Correlations of Gamma-Ray Burst Morphology and The Internal Luminosity Function

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...20314104f&link_type=abstract

American Astronomical Society Meeting 203, #141.04; Bulletin of the American Astronomical Society, Vol. 36, p.587

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The Internal Luminosity Function (ILF) is a tool that can be used to study gamma-ray burst (GRB) morphology. The ILF is a measure of the luminosity distribution within a GRB. The ILF can be fit by two strongly correlated but independent attributes: a power-law index and a power-law curvature index. These indices have been shown to very strongly anti-correlate with duration and fluence. We demonstrate here that the ILF indices also anti-correlate with the number of pulses found in a GRB; bursts with few pulses have flat power-law indices while those with many pulses have steep indices. The ILF is thus a morphology indicator because there is more low-luminosity emission from multiple pulses than high-luminosity emission. This work is supported by NSF grant AST00-98499.

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