Engineering topics

Hueter, G. J.

Publications and source records attributed to Hueter, G. J..

5 records

NASA NTRS1985

HEAO-1 observations of gamma ray bursts

A search of data from the High Energy X-Ray and Low Energy Gamma Ray Experiment on HEAO-1 uncovered 14 gamma ray bursts. Nine of these events are reported for the first tiome. Except for the faintest events, all of the bursts detected by this experiment have been measured above an MeV, thereby confirming the hard spectral character of gamma ray burst spectra reported by SMM. Results give a burst rate of at least 105 per year above 6 times 10 to the minus 7th power ergs, which is consistent with previous measurements of burst frequency.

Hueter, G. J.↗

NASA NTRS1983

A distance model for gamma-ray bursts

The apparent contradiction between the isotropic latitude distribution and the flat size-frequency distribution of gamma-ray bursts is discussed. It is shown that the data are not inconsistent but rather can be easily explained by a nonsingular distribution of burst energies such as that implied by a fireball model for gamma-ray bursts.

Lingenfelter, R. E.↗

NASA NTRS1983

Observation of an absorption feature in a gamma ray burst spectrum

A gamma ray burst was detected on March 25, 1978 by the High Energy X-ray and Low Energy Gamma Ray Experiment on HEAO-1. The burst spectrum shows an absorption feature at 55 + or - 5 keV with an equivalent width of 13 + or - 3 keV, values commensurate with those of similar features observed by the KONUS experiment. The burst spectrum also is characterized by a hard component extending from about 0.25-6 MeV. This component can be interpreted in terms of a fireball model for gamma ray bursts, which places the distance to the source at 1 kpc. The integrated fluence of the burst between 0.025 and 6 MeV is 1.5 x 10 to the -5th ergs/sq cm. The burst source has been localized to within a degree of RA = 237.5 deg and Dec = 76.2 deg.

Hueter, G. J.↗

NASA NTRS1983

A fireball model for the March 25, 1978 gamma ray burst

It is suggested that the bulk of the gamma-ray emission in the March 25, 1978 burst comes from a fireball of photons and electron-positron pairs expanding from a jet off the polar cap of a neutron star, and that the duration of the burst is defined by the expansion and dissipation times of the fireball. This model makes it possible to determine the total energy, about 10 to the 39th ergs, and the distance, about 1kpc, of the burst and should be applicable to a large class of gamma-ray bursts.

Hueter, G. J.↗

NASA NTRS1982

An absorption feature in the spectrum of a gamma ray burst on 25 March 1978

The High Energy X-ray and Low Energy Gamma Ray Experiment on HEAO-1 detected a gamma ray burst on March 25, 1978. The main peak of the event lasted 10 seconds, while less intense emission was observed for approximately 100 seconds. The burst spectrum shows an apparent absorption feature at 55 +/- 5 keV with an equivalent width of 13 +/- 3 keV, values commensurate with those reported for bursts recorded by the KONUS experiment. The integrated fluence between 30 keV and 6.1 Mev was 0.000015 ergs/sq cm. The detection syste has localized the burst source to within a degree of RA = 237.2 deg and Dec. = 76.4 deg.

Hueter, G. J.↗