Gamma-burst studies using long-duration balloon flights in the Arctic

Details Gamma-burst studies using long-duration balloon flights in the Arctic Gamma-burst studies using long-duration balloon flights in the Arctic

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ap%26ss..75..145l&link_type=abstract

(Symposium on Cosmic Gamma-Ray Bursts, Toulouse, France, Nov. 26-29, 1979.) Astrophysics and Space Science, vol. 75, no. 1, Mar.

Astronomy and Astrophysics

Astronomy

8

Arctic Regions, Balloon Flight, Gamma Ray Astronomy, Radiation Detectors, Accuracy, Background Radiation, Balloon-Borne Instruments, Line Of Sight Communication, X Rays

Scientific paper

The testing of a new detector for the accurate localization of cosmic gamma-burst sources in long-duration balloon flights over the Arctic is presented. The WATCH (Wide Angle Telescope for Cosmic Hard X-rays) detector is based on the principle of the rotation modulation collimator, with, however the second grid of a conventional collimator replaced by two interleaved detectors consisting of alternating NaI (Tl) and CsI (Na) scintillator bars. Although the detector is intended for satellite flights, development tests were conducted on a balloon version carried along with a spin motor, sun sensor, pressure and temperature sensors, telemetry system and controlling microprocessor on a flight from Norway under conditions of the midnight sun. Although a long, level flight was not achieved and the balloon altitude was not sufficient for accurate cosmic gamma-burst localization, the X-ray background was found to be unexpectedly low, with a count rate of about 25 counts/sec in the energy interval 40-130 keV. Although no gamma ray bursts were detected, the flight is considered successful in demonstrating the feasibility of zero-pressure balloon flights of extended duration with telemetry coverage in the Arctic, and further test flights are planned.

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