Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993stin...9427996c&link_type=abstract
Unknown
Astronomy and Astrophysics
Astronomy
Gamma Ray Astronomy, Gamma Ray Bursts, Satellite Design, Satellite Instruments, Scintillating Fibers, Small Scientific Satellites, Angular Resolution, Covariance, Error Analysis, Triangulation, Trigger Circuits
Scientific paper
A study on the feasibility of using a system of small, light, long-lived and simple satellites in order to locate gamma-ray bursters is presented. Each small satellite possesses only electronics to discriminate gamma rays out of the large background of cosmic rays and to time the arrival of the front of a gamma ray burst. The arrival of a gamma ray strikes a plane made out of scintillating fibers. A layered structure of thin lead foils and scintillating fibers is used to obtain a low trigger threshold of approximately 20 MeV. To locate the burster applying triangulation methods, the system uses the time of arrival of the front of the gamma-ray burst and the position of the satellites at that very moment. The authors review an elementary version of the triangulation method to study the angular error in the determination of the burster position. They show that for almost all nonpathological distances among satellites, the angular location of the source can be determined to better than one arc min. This precision allows the visible counterpart of the burster to be found, if it exists. These simple satellites can be made modular in order to customize their sizes or weights in order to use spare space available during major launches. Also proposed is a block diagram for the satellite architecture as well as a simple and strong detector using scintillating fiber technology.
Colavita Alberto A.
Colavita P.
Fratnik Fabio
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