Aaron J Bird

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The gamma-ray astronomical observatory INTEGRAL, succesfully launched on 17 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 29◦ × 29◦ in the energy range from 15 keV to 10 MeV with typical on-axis(More)
Pulsar systems accelerate particles to immense energies. The detailed functioning of these engines is still poorly understood, but polarization measurements of high-energy radiation may allow us to locate where the particles are accelerated. We have detected polarized gamma rays from the vicinity of the Crab pulsar using data from the spectrometer on the(More)
Aims. We communicate the detection of soft (20–200 keV) γ-rays from the pulsar and pulsar wind nebula of PSR J1846−0258 and aim to identify the component of the system which is responsible for the γ-ray emission. Methods. We combine spectral information from the INTEGRAL γ-ray mission with archival data from the Chandra Xray Observatory to pinpoint the(More)
The true nature of the progenitor to GRBs remains elusive; one characteristic that would constrain our understanding of the GRB mechanism considerably is gamma-ray polarimetry measurements of the initial burst flux. We present a method that interprets the prompt GRB flux as it Compton scatters off the Earth’s atmosphere, based on detailed modelling of both(More)
We report on the first census of INTEGRAL/IBIS detections (& 4σ significance) above 100 keV based on the Core Program and public Open time observations up to April 2005. There are 49 sources detected in the 100-150 keV band of which 14 are also seen in the 150-300 keV range. The low energy sample is dominated by X-ray binary systems of both low and high(More)
Fast X-ray Transients (FXTs) are believed to be non-recurrent bright X-ray sources lasting less than a day and occuring at serendipitous positions, they can best be detected and discovered by instruments having a sufficiently wide field of view and high sensitivity. The IBIS/ISGRI instrument onboard INTEGRAL is particularly suited to detect new or already(More)
We report the discovery of a soft gamma ray source, namely IGR J18135-1751, detected with the IBIS imager on board the INTEGRAL satellite. The source is persistent and has a 20-100 keV luminosity of ∼5.7 × 10 erg s (assuming a distance of 4kpc). This source is coincident with one of the ten objects recently reported by the HESS collaboration as part of the(More)
The first IBIS galactic plane survey has provided a list of high energy emitting objects above 20 keV; these sources have been detected mostly in the crowded region of the Galactic Centre and partly along the Galactic Plane. In order to validate the detection procedure, to help in the identification process and to study the nature of these IBIS sources,(More)
We report the discovery of a soft gamma ray source, namely IGR J18135-1751, detected with the IBIS imager on board the INTEGRAL satellite. The source is persistent and has a 20-100 keV luminosity of ∼5.7 × 10 erg s (assuming a distance of 4kpc). This source is coincident with one of the ten objects recently reported by the HESS collaboration as part of the(More)
We report on the identification of a new soft gamma-ray source, IGR J12319–0749, detected with the IBIS imager on board the INTEGRAL satellite. The source, which has an observed 20−100 keV flux of ∼8.3 × 10−12 erg cm−2 s−1, is spatially coincident with an active galactic nucleus (AGN) at redshift z = 3.12. The broad-band continuum, obtained by combining XRT(More)