Query : 2006A&A...456..379G

2006A&A...456..379G - Astronomy and Astrophysics, volume 456, 379-387 (2006/9-2)

Using the active collimator and shield assembly of an EXIST-type mission as a gamma-ray burst spectrometer.


Abstract (from CDS):

The Energetic X-Ray Imaging Survey Telescope (EXIST) is a mission design concept that uses coded masks seen by Cadmium Zinc Telluride (CZT) detectors to register hard X-rays in the energy region from 10keV to 600keV. A partially active or fully active anti-coincidence shield/collimator with a total area of between 15m2 and 35m2 will be used to define the field-of-view of the CZT detectors and to suppress the background of cosmic-ray-induced events. In this paper, we describe the use of a sodium activated cesium iodide shield/collimator to detect gamma-ray bursts (GRBs) and to measure their energy spectra in the energy range from 100keV up to 10MeV. We use the code GEANT 4 to simulate the interactions of photons and cosmic rays with the spacecraft and the instrument and the code DETECT2000 to simulate the optical properties of the scintillation detectors. The shield/collimator achieves a νFν-sensitivity of 3x10–9erg/cm2/s and 2x10–8erg/cm2/s at 100keV and 600keV, respectively. The sensitivity is well matched to that of the coded mask telescope.The broad energy coverage of an EXIST-type mission with active shields will constrain the peak of the spectral energy distribution (SED) for a large number of GRBs. The measurement of the SED peak may be key for determining photometric GRB redshifts and for using GRBs as cosmological probes.

Abstract Copyright:

Journal keyword(s): gamma-rays: bursts - instrumentation: detectors - instrumentation: spectrographs

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 SN 2003dh SN* 10 44 50.030 +21 31 18.15     16.2     SNIcpec 1194 1
2 2B 920622 gB 10 48.4 +47 10           ~ 54 0

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