Max Tegmark's cosmology library: bursts
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(the smoothed burst map shown above),
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if you are interested in
other research of mine.
THE ANGULAR POWER SPECTRUM OF BATSE 3B GAMMA-RAY BURSTS
Dieter H. Hartmann,
Michael S. Briggs & Charles A. Meegan
We compute the angular power spectrum C_l from the
BATSE 3B catalog
gamma-ray bursts, and find no evidence for clustering on any scale.
These constraints bridge the entire range from small scales
(which probe source clustering and burst repetition)
to the largest scales (which constrain possible anisotropies from the
or from nearby cosmological large scale structures).
We develop an analysis technique that takes the
angular position errors into account,
which enables us to place tight upper limits on
the clustering down to scales l\approx 60,
corresponding to a few degrees on the sky.
The minimum-variance burst weighting that we employ is
graphically visualized as an all-sky map where each burst is smeared out
by an amount corresponding to its position uncertainty.
We also present separate band-pass filtered sky maps for the quadrupole
and for the multipole-ranges l=3-10 and l=11-30, so that
the fluctuations on different angular scales can be separately
inspected for visual features such as localized
``hot spots" or structures aligned with the Galactic plane.
These filtered maps reveal no apparent deviations from isotropy.
This site also contains the latest versions of a paper that is referenced in
You can find many of the referenced papers from the BATSE team
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This page was last modified July 1, 1998.