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Frequently Asked Questions

Below is a list of frequently asked questions, either about HETE, GRB science, or the contents of this web site.

GRB Science



What is a gamma-ray burst?

A gamma-ray burst (GRB) is a cosmic explosion with a total (isotropic) energy of 1053-1054 ergs! Such explosions, if indeed they are isotropic, are 100-1000 times as energetic as a supernova outburst. At the distances to which GRBs have been measured (z = 3.5), they are excellent "beacons" for tracing the structure of the early universe. Estimates by Lamb and Riechert indicate that HETE-2 has sufficient sensitivity to GRBs as distant as z = 10-20.
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How does coded aperture imaging work?

Coded aperture imaging measures the shift of the mask pattern in the shadow created by the mask.

An excellent set of papers on the subject can be found here.

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Where is HETE pointing now?

HETE is almost always pointing in the anti-solar direction. To see where HETE is pointing in the sky, look here.
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Is there a list of acronyms?

There sure is! Look here.
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