Recent measurements with a satellite-borne cooled germanium spectrometer. Part 1: Observations of the 18 December 1972 gamma ray burst

Details Recent measurements with a satellite-borne cooled germanium spectrometer. Part 1: Observations of the 18 December 1972 gamma ray burst Recent measurements with a satellite-borne cooled germanium spectrometer. Part 1: Observations of the 18 December 1972 gamma ray burst

Nov 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974csgr.conf...17n&link_type=abstract

In ESRO The Context and Status of Gamma Ray Astronomy p 17-24 (SEE N75-25813 16-93)

Astronomy and Astrophysics

Astronomy

3

Gamma Rays, Radio Bursts, Satellite Observation, Scintillation Counters, Spectrometers, Background Radiation, Black Body Radiation, Energy Spectra, Flux Density, Periodic Variations, Satellite-Borne Instruments, Vela Satellites

Scientific paper

Fast time resolution measurements were made on the gamma ray intensity fluctuations and energy spectra during the early phase of the 18 December 1972 gamma burst, which was initially identified by the Vela satellite system. These observations were performed with the first cooled germanium spectrometer flown in space on-board the low-altitude polar orbiting satellite, 1972-076B. Counting rates in the energy range 50 keV to 3 MeV were observed to increase above background by more than an order of magnitude in a series of pronounced and narrow microbursts which occurred as precursors to the Vela trigger. The microbursts have rise and fall times of about 30 msec with pulse widths typically of about 60 msec which indicate the extent of the microburst source region to be less than approximately 1.8 x 10 to the 9th power cm. The photon spectrum is harder in the more intense microburst, being suggestive of a blackbody spectrum, and softens at later times after the Vela trigger.

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