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Gamma-Ray Bursts, 0.05-6.5 MeV Direction, Profile, Spectrum

NSSDC ID: 1978-079A-15
Mission Name: ISEE 3
Principal Investigator: Dr. Bonnard J. Teegarden


This experiment was designed to recognize and record the time history of gamma-ray bursts, and to provide high-resolution spectra of gamma-ray burst photons between 0.05 and 6.5 MeV. Three detectors were used. Detector 1 was a 4-cm diameter by 3-cm-thick germanium crystal, radiatively cooled to operate at approximately 101 deg K. The energy range was between 0.12 and 6.5 MeV, and the energy resolution was <3.5 keV at 1 MeV. A 4096-channel A/D converter digitized the signals for input to the gamma-burst digital instrumentation, which was in the low-energy cosmic-ray experiment, 78-079A-03. Detector 2 consisted of the CsI and surrounding detectors in the cosmic-ray electrons and nuclei experiment, 78-079A-06. Both temporal and spectral information were obtained from this detector. This detector was felt to be somewhat noisy. Detector 3 consisted of the smaller CsI crystal in experiment 78-079A-03. Its energy range began at about 79 keV. Two time-history memories of 2000 12-bit words were used, and received information from any of the three detectors by command. The stored values were time intervals over which a fixed number (1-128) of counts was accumulated. The time-interval clock frequency was selectable from 1 to 8 kHz. Spectral information from either detector 1 or 2 was stored in a third memory of 3072 16-bit words. Twelve bits were used for pulse-height data and four bits for time. The counting rate input to the time history memories caused a trigger signal to occur if the rate exceeded a commandable value. When this occurred, all three memories were allowed to fill. These memories could be read out at a very low bit rate, either automatically or by command.


  • Astronomy: Gamma Ray
  • Solar Physics: Gamma Ray
  • Space Physics: Zodiacal Light/Interplanet Dust

Additional Information

Questions or comments about this experiment can be directed to: Dr. H. Kent Hills.



NameRoleOriginal AffiliationE-mail
Prof. George GloecklerOther InvestigatorUniversity of
Dr. Dieter K. HovestadtOther InvestigatorMax-Planck-Institut fur Extraterrestrische Physik 
Dr. Thomas L. ClineOther InvestigatorNASA Goddard Space Flight
Dr. Bonnard J. TeegardenPrincipal InvestigatorNASA Goddard Space Flight

Selected References

Cline, T. L., et al., ISEE-A and ISEE-C gamma-ray burst detectors, IEEE Trans. Geosci. Electron., GE-16, No. 3, 173-175, July 1978.

Teegarden, B. J., and T. L. Cline, High-resolution spectroscopy of gamma-ray bursts, Astrophys. Space Sci., 75, No. 1, 181-191, 1981.

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