Timing and transient mission in X-ray astronomy: an assessment study

Details Timing and transient mission in X-ray astronomy: an assessment study Timing and transient mission in X-ray astronomy: an assessment study

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ttmx.book......&link_type=abstract

Timing and transient mission in X-ray astronomy: An assessment study

Astronomy and Astrophysics

Astronomy

Spaceborne Photography, Spacelab Payloads, Surges, Time Functions, X Ray Astronomy, Ariane Launch Vehicle, Assessments, Astronomical Photography, Gamma Ray Astronomy, Panoramic Cameras, Phosphors

Scientific paper

The proposed Spacelab timing and transient mission intends to study the temporal variability of a wide range of X ray emitters, to survey the sky every few days at a sensitivity on one Uhuru unit to monitor long term variability, to make a comprehensive study of the complex transient and burst phenomena; and (4) to extend X-ray spectral measurement to much higher energies. The baseline payload considered consists of four instruments. A large area proportional counter will provide the high photon collection rate needed for the timing experiment. The hard X ray response will be obtained by incorporation of a phoswich detector. A unique wide field camera will image the sky to detect, locate, and measure X-ray transient events, as well as X-ray and gamma bursts. Finally in order to detect brighter and rarer gamma ray bursts a small wide field of view gamma ray burst detector is included. The total mass of the satellite including both payload and spacecraft is about 950 kg, which is compatible with an Ariane launcher. Volume and overall dimensions do not exclude the use of a dual launch configuration. An equatorial orbit at an altitude of less than 600 km will be required in order to keep the instrument background the lowest possible and most stable in time. The required orbital lifetime is three years. Bubble memories will provide 250 Mbits on board storage allowing an average data accumulation rate between successive transits over a single ground station of 40 Kbits/sec. Maximum accumulation rates of about 250 Kbits/sec will be available.

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