22 research outputs found
Scientific Performance of the ISDC Quick Look Analysis
The INTEGRAL Science Data Centre (ISDC) routinely monitors the Near Real Time
data (NRT) from the INTEGRAL satellite. A first scientific analysis is made in
order to check for the detection of new, transient or highly variable sources
in the data. Of primary importance for this work is the Interactive Quick Look
Analysis (IQLA), which produces JEM-X and ISGRI images and monitors them for
interesting astrophysical eventsComment: 4 pages, 3 figures. Proceedings of 5th INTEGRAL Workshop: The
INTEGRAL Universe, Munich, 16-20 February 2004. Accepted for publication in
European Space Agency Special Publication 552. See paper for institute
affiliation
The INTEGRAL/IBIS Scientific Data Analysis
The gamma-ray astronomical observatory INTEGRAL, succesfully launched on 17th
October 2002, carries two large gamma-ray telescopes. One of them is the
coded-mask imaging gamma-ray telescope onboard the INTEGRAL satellite (IBIS)
which provides high-resolution (~ 12') sky images of 29deg x 29deg in the
energy range from 15 keV to 10 MeV with typical on-axis sensitivity of ~ 1
mCrab at 100 keV (3 sigma, 10E6 s exposure). We report here the general
description of the IBIS coded-mask imaging system and of the standard IBIS
science data analysis procedures. These procedures reconstruct, clean and
combine IBIS sky images providing at the same time detection, identification
and preliminary analysis of point-like sources present in the field. Spectral
extraction has also been implemented and is based on simultaneous fitting of
source and background shadowgram models to detector images. The procedures are
illustrated using some of the IBIS data collected during the inflight
calibrations and present performance is discussed. The analysis programs
described here have been integrated as instrument specific software in the
Integral Science Data Center (ISDC) analysis software packages currently used
for the Quick Look, Standard and Off-line Scientific Analysis.Comment: 7 pages, 13 figures (6 color), accepted for publication in A&A Lett
(INTEGRAL special issue). Full resulution color figures can be found in the
printed version of the paper (see
http://www.edpsciences.org/articles/aa/abs/2003/43/contents/contents.html
ISGRI: the INTEGRAL Soft Gamma-Ray Imager
For the first time in the history of high energy astronomy, a large CdTe
gamma-ray camera is operating in space. ISGRI is the low-energy camera of the
IBIS telescope on board the INTEGRAL satellite. This paper details its design
and its in-flight behavior and performances. Having a sensitive area of 2621
cm with a spatial resolution of 4.6 mm, a low threshold around 12 keV and
an energy resolution of 8% at 60 keV, ISGRI shows absolutely no signs of
degradation after 9 months in orbit. All aspects of its in-flight behavior and
scientific performance are fully nominal, and in particular the observed
background level confirms the expected sensitivity of 1 milliCrab for a 10s
observation.Comment: INTEGRAL A&A special issu
INTEGRAL: In flight behavior of ISGRI and SPI
International audienceThe payload of INTEGRAL, the space gamma-ray observatory launched in October 2002, features two gamma-ray telescopes that take advantage of the semiconductor technologies. The spectrometer SPI, is equipped with 19 high-purity germanium detectors cooled at 85 K. We will report on the SPI in-flight background, performance, the detector evolution and the annealings performed every 6 months. The INTEGRAL Soft Gamma-Ray Imager (ISGRI) is the low-energy camera of the IBIS telescope. It is the first large camera equipped with CdTe detectors. We will present some system aspects, in particular the noisy pixel handling and will report on its in-flight background, performance and their evolution