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The Swift Gamma-Ray Burst Mission
The Swift mission will determine the origin of GRB, classify GRBs and search for new types, study the interaction of the ultrarelativistic outflows of GRBs with their surrounding medium, and use GRBs to study the early universe out to z >10.
The Burst Alert Telescope (BAT) on the SWIFT Midex Mission
Abstracthe burst alert telescope (BAT) is one of three instruments on the Swift MIDEX spacecraft to study gamma-ray bursts (GRBs). The BAT first detects the GRB and localizes the burst direction to…
GRB 090423 at a redshift of z ≈ 8.1
Observations of GRB 090423 and the near-infrared spectroscopic measurement of its redshift are reported, suggesting that the mechanisms and progenitors that gave rise to this burst about 600,000,000 years after the Big Bang are not markedly different from those producing GRBs about 10, thousands of years later.
Gamma-Ray Burst Peak Duration as a Function of Energy
Gamma-ray burst time histories often consist of many peaks. These peaks tend to be narrower at higher energy. If gamma-ray bursts are cosmological, the energy dependence of gamma-ray burst timescales…
A giant γ-ray flare from the magnetar SGR 1806–20
Two classes of rotating neutron stars—soft γ-ray repeaters (SGRs) and anomalous X-ray pulsars—are magnetars, whose X-ray emission is powered by a very strong magnetic field (B ≈ 1015 G). SGRs…
New family of binary arrays for coded aperture imaging.
With the addition of MURAs to the family of binary arrays, all prime numbers can now be used for making optimal coded apertures, increasing the number of available square patterns by more than a factor of 3.
A short γ-ray burst apparently associated with an elliptical galaxy at redshift z = 0.225
Gamma-ray bursts (GRBs) come in two classes: long (> 2 s), soft-spectrum bursts and short, hard events. Most progress has been made on understanding the long GRBs, which are typically observed at…
Coded aperture imaging with uniformly redundant arrays.
Computer simulations show that the URA with significant shot and background noise is vastly superior to random array techniques without noise, and permits a detector which is smaller than its random array counterpart.
THE 22 MONTH SWIFT-BAT ALL-SKY HARD X-RAY SURVEY
We present the catalog of sources detected in the first 22 months of data from the hard X-ray survey (14–195 keV) conducted with the Burst Alert Telescope (BAT) coded mask imager on the Swift…
A Possible Cepheid-like Luminosity Estimator for the Long Gamma-Ray Bursts
We present a possible Cepheid-like luminosity estimator for the long gamma-ray bursts based on the variability of their light curves. To construct the luminosity estimator, we use CGRO/BATSE data for…