Hard X-ray All-Sky Imaging Using BATSE/CGRO

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Session 71 -- Instruments and Techniques
Oral presentation, Thursday, 10:30-12:00, Durham Room

[71.05] Hard X-ray All-Sky Imaging Using BATSE/CGRO

S. N. Zhang (USRA/MSFC), G. J. Fishman, B. A. Harmon (NASA/MSFC), W. S. Paciesas (UAH), B. C. Rubin (USRA/MSFC), C. A. Meegan, C. A. Wilson (NASA/MSFC), M. H. Finger (CSC/MSFC)

A new imaging technique has been developed for the Burst and Transient Source Experiment (BATSE) on the Compton Gamma Ray Observatory (CGRO) to use the Large Area Detectors (LADs) to image the hard X-ray and low energy gamma-ray sky in the energy range between 20 keV to 2 MeV. Source occultation by the Earth is modelled by Radon Transform and various reconstruction methods are used to produce images. The performance of this imaging technique is evaluated using occultation data for known sources including the Crab Nebula and variable sources in the galactic center region. Location accuracy of about 0.1 degree and source separation of about 1 degree can be achieved. Using one of the eight LADs of BATSE, a field of view of up to 40 degrees by 40 degrees can be achieved with almost uniform sensitivity. Combining all eight LADs together, a whole sky image is potentially obtainable over several weeks. We report here the methodology and performance of this technique and results we obtained so far applying this technique to BATSE.

Thursday program listing