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A. D. Stallworth, J. Hakkila, T. W. Giblin (College of Charleston)
The properties of the Long class of gamma-ray bursts are studied relative to the Internal Luminosity Function (ILF). The ILF is the distribution of luminosity within a gamma-ray burst and is thus an intrinsic burst property. The ILF of most Long bursts can be described accurately using a power-law index modified by a power-law curvature parameter. A flat power-law index indicates a large amount of high luminosity emission relative to low luminosity emission, while a steep power-law index indicates a large amount of high luminosity emission relative to low luminosity emission. Bursts with steep power-law indices also tend to show large ILF curvatures, indicating that they are also deficient in lower-luminosity emission relative to bursts with flat power-law indices. The ILF anticorrelates with duration and fluence and correlates with duty cycle, indicating the with large ILF curvatures tend to be longer, brighter (as measured by fluence), and less persistent than bursts emitting a broad range of luminosities. This work is funded by NASA grant NRA-98-OSS-03 and NSF grant AST00-98499.
The author(s) of this abstract have provided an email address for comments about the abstract: hakkilaj@cofc.edu
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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.