S. D. Hunter

Goddard Space Flight Center

*This is an algorithmically generated author record based on publicly available information.

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Goddard Space Flight Center

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S. D. Hunter has a total of 71 co-authors. Here are the top co-authors by number of shared publications:

D. L. Bertsch
Code 661, NASA/Goddard Space Flight Center, Greenbelt, Maryland 20771
11 shared publications
R. C. Hartman
NASA/GSFC Code 661 20771 Greenbelt MD
11 shared publications
D. J. Thompson
Code 661, NASA/Goddard Space Flight Center, Greenbelt, Maryland 20771
10 shared publications
G. Kanbach
Max-Planck Institut fur Extraterrestrische Physik, Giessenbachstr. D-85748, Garching, Germany
10 shared publications
P. Sreekumar
ISRO Satellite center, Bangalore, India
10 shared publications
D. A. Kniffen
Code S, NASA Headquarters, 300 E. St. SW, Washington, District of Columbia 20024
9 shared publications

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- 24 August 2005
- Published by Institute of Electrical and Electronics Engineers (IEEE)
The Estimation Of Background Production By Cosmic Rays In High Energy Gamma-ray Telescopes
by H.L. Edwards, P.L. Nolan, E.B. Hughes, D. Koch, D.L. Bertsch, C.E. Fichtel, R.C. Hartman, S.D. Hunter, D.A. Kniffen, D.J. Thompson, et al.
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- 24 August 2005
- Published by Institute of Electrical and Electronics Engineers (IEEE)
The Estimation Of Background Production By Cosmic Rays In High Energy Gamma-ray Telescopes
by H.L. Edwards, P.L. Nolan, E.B. Hughes, D. Koch, D.L. Bertsch, C.E. Fichtel, R.C. Hartman, S.D. Hunter, D.A. Kniffen, D.J. Thompson, et al.
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Cited by 7
- 1 November 2000
- Published by AIP Publishing in AIP Conference Proceedings
Spectral modeling of the EGRET 3EG gamma ray sources near the Galactic Plane
by D. L. Bertsch, R. C. Hartman, S. D. Hunter, D. J. Thompson, Y. C. Lin, D. A. Kniffen, G. Kanbach, H. A. Mayer-Hasselwander, O. Reimer, P. Sreekumar
The third EGRET catalog lists 84 sources within 10° of the Galactic Plane. Five of these are well-known spin-powered pulsars, 2 and possibly 3 others are blazars, and the remaining 74 are classified as unidentified, although 6 of these are likely to be artifacts of nearby strong sources. Several of the remaining 68 unidentified sources have been noted as having positional agreement with supernovae remnants and OB associations. Others may be radio-quiet pulsars like Geminga, and still others may belong to a totally new class of sources. The question of the energy spectral distributions of these sources is an important clue to their identification. In this paper, the spectra of the sources within 10° of Galactic Plane are fit with three different functional forms; a single power law, two power laws, and a power law with an exponential cutoff. Where possible, the best fit is selected with statistical tests. Twelve, and possibly an additional 5 sources, are found to have spectra that are fit by a breaking power law or by the power law with exponential cutoff function.
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- 1 November 2000
- Published by AIP Publishing in AIP Conference Proceedings
Spectral modeling of the EGRET 3EG gamma ray sources near the Galactic Plane
by D. L. Bertsch, R. C. Hartman, S. D. Hunter, D. J. Thompson, Y. C. Lin, D. A. Kniffen, G. Kanbach, H. A. Mayer-Hasselwander, O. Reimer, P. Sreekumar
The third EGRET catalog lists 84 sources within 10° of the Galactic Plane. Five of these are well-known spin-powered pulsars, 2 and possibly 3 others are blazars, and the remaining 74 are classified as unidentified, although 6 of these are likely to be artifacts of nearby strong sources. Several of the remaining 68 unidentified sources have been noted as having positional agreement with supernovae remnants and OB associations. Others may be radio-quiet pulsars like Geminga, and still others may belong to a totally new class of sources. The question of the energy spectral distributions of these sources is an important clue to their identification. In this paper, the spectra of the sources within 10° of Galactic Plane are fit with three different functional forms; a single power law, two power laws, and a power law with an exponential cutoff. Where possible, the best fit is selected with statistical tests. Twelve, and possibly an additional 5 sources, are found to have spectra that are fit by a breaking power law or by the power law with exponential cutoff function.
Cited by 7
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- 1 January 1997
- Published by AIP Publishing
Temporal and spectral studies of unidentified EGRET high latitude sources
by O. Reimer, D. L. Bertsch, B. L. Dingus, J. A. Esposito, R. C. Hartman, S. D. Hunter, B. B. Jones, G. Kanbach, D. A. Kniffen, Y. C. Lin, et al.
Source distribution studies only provide meaningful information if the basic populations are carefully determined, especially if the statistics are limited. This necessitates restrictions from the approach of using the complete EGRET source catalog data. Considering various peculiarities of the catalogs a more uniform data set is defined for further source distribution studies. Here, we focus on the temporal and spectral characteristic of the unidentified EGRET high latitude sources $(| b |>10°).$ Variability is addressed on the basis of flux histories with timescales of individual viewing periods, and spectra are determined for all sources based on the enhanced statistics from EGRET observations of Phase 1 to 4. The derived features are used to discuss whether the unidentified high latitude sources show similarities or differences from classes of already identified objects, or if no conclusive answer can be given.
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- 1 January 1997
- Published by AIP Publishing
Temporal and spectral studies of unidentified EGRET high latitude sources
by O. Reimer, D. L. Bertsch, B. L. Dingus, J. A. Esposito, R. C. Hartman, S. D. Hunter, B. B. Jones, G. Kanbach, D. A. Kniffen, Y. C. Lin, et al.
Source distribution studies only provide meaningful information if the basic populations are carefully determined, especially if the statistics are limited. This necessitates restrictions from the approach of using the complete EGRET source catalog data. Considering various peculiarities of the catalogs a more uniform data set is defined for further source distribution studies. Here, we focus on the temporal and spectral characteristic of the unidentified EGRET high latitude sources $(| b |>10°).$ Variability is addressed on the basis of flux histories with timescales of individual viewing periods, and spectra are determined for all sources based on the enhanced statistics from EGRET observations of Phase 1 to 4. The derived features are used to discuss whether the unidentified high latitude sources show similarities or differences from classes of already identified objects, or if no conclusive answer can be given.
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- 1 January 1997
- Published by AIP Publishing
Development of gas micro-structure detectors for gamma-ray astronomy
by S. D. Hunter, S. V. Belolipetskiy, D. L. Bertsch, J. R. Catelli, H. Crawford, W. M. Daniels, P. Deines-Jones, J. A. Esposito, H. Fenker, B. Gossan, et al.
Large area gas micro-structure detectors are being developed for the next generation high-energy gamma-ray telescope as part of NASA’s SR&T program to support new technologies. These low-cost detectors are produced by laser micromachining of metalized polyimide films layered on carbon fiber composite substrates. This integrated detector and support design reduces the detector complexity and associated assembly costs. Accomplishments to date include testing of a 32 channel ASIC for the front-end electronics and integration of functional hardware into prototype detectors for tests of the FPGA readout system and event display software.
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- 1 January 1997
- Published by AIP Publishing
Development of gas micro-structure detectors for gamma-ray astronomy
by S. D. Hunter, S. V. Belolipetskiy, D. L. Bertsch, J. R. Catelli, H. Crawford, W. M. Daniels, P. Deines-Jones, J. A. Esposito, H. Fenker, B. Gossan, et al.
Large area gas micro-structure detectors are being developed for the next generation high-energy gamma-ray telescope as part of NASA’s SR&T program to support new technologies. These low-cost detectors are produced by laser micromachining of metalized polyimide films layered on carbon fiber composite substrates. This integrated detector and support design reduces the detector complexity and associated assembly costs. Accomplishments to date include testing of a 32 channel ASIC for the front-end electronics and integration of functional hardware into prototype detectors for tests of the FPGA readout system and event display software.
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- 1 January 1997
- Published by AIP Publishing
EGRET observations of PKS 0528+134 from 1991 to 1997
by R. Mukherjee, D. L. Bertsch, S. D. Bloom, B. L. Dingus, J. A. Esposito, R. C. Hartman, S. D. Hunter, G. Kanbach, D. A. Kniffen, A. Kraus, et al.
The compact, radio-loud quasar PKS $0528+134$ has been one of the brightest active galactic nuclei (AGN) detected by EGRET. The flux history of the source including data up to March 1997, as well as the spectra measured during the flaring and non-flaring states is presented. Multiwavelength observations of PKS $0528+134$ are also presented. A detailed relativistic SSC jet model agrees well with the multiwavelength spectrum; the data, however are insufficient to discriminate between this and other emission models.
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- 1 January 1997
- Published by AIP Publishing
EGRET observations of PKS 0528+134 from 1991 to 1997
by R. Mukherjee, D. L. Bertsch, S. D. Bloom, B. L. Dingus, J. A. Esposito, R. C. Hartman, S. D. Hunter, G. Kanbach, D. A. Kniffen, A. Kraus, et al.
The compact, radio-loud quasar PKS $0528+134$ has been one of the brightest active galactic nuclei (AGN) detected by EGRET. The flux history of the source including data up to March 1997, as well as the spectra measured during the flaring and non-flaring states is presented. Multiwavelength observations of PKS $0528+134$ are also presented. A detailed relativistic SSC jet model agrees well with the multiwavelength spectrum; the data, however are insufficient to discriminate between this and other emission models.
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Cited by 21
- 1 August 1996
- Published by American Astronomical Society in The Astrophysical Journal Supplement Series
EGRET Observations of the Region to the South of B = -30 degrees in Phase 1 and Phase 2 of the Compton Gamma Ray Observatory Viewing Program
by Y. C. Lin, D. L. Bertsch, B. L. Dingus, J. A. Esposito, C. E. Fichtel, J. M. Fierro, R. C. Hartman, S. D. Hunter, G. Kanbach, D. A. Kniffen, et al.
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- 1 August 1996
- Published by American Astronomical Society in The Astrophysical Journal Supplement Series
EGRET Observations of the Region to the South of B = -30 degrees in Phase 1 and Phase 2 of the Compton Gamma Ray Observatory Viewing Program
by Y. C. Lin, D. L. Bertsch, B. L. Dingus, J. A. Esposito, C. E. Fichtel, J. M. Fierro, R. C. Hartman, S. D. Hunter, G. Kanbach, D. A. Kniffen, et al.
Cited by 21
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Cited by 43
- 1 November 1994
- Published by American Astronomical Society in The Astrophysical Journal
Gamma-ray observations of Ophiuchus with EGRET: The diffuse emission and point sources
by S. D. Hunter, S. W. Digel, E. J. de Geus, G. Kanbach
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- 1 November 1994
- Published by American Astronomical Society in The Astrophysical Journal
Gamma-ray observations of Ophiuchus with EGRET: The diffuse emission and point sources
by S. D. Hunter, S. W. Digel, E. J. de Geus, G. Kanbach
Cited by 43
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Cited by 34
- 1 October 1994
- Published by American Astronomical Society in The Astrophysical Journal
Search of the energetic gamma-ray experiment telescope (EGRET) data for high-energy gamma-ray microsecond bursts
by C. E. Fichtel, D. L. Bertsch, B. L. Dingus, J. A. Esposito, R. C. Hartman, S. D. Hunter, G. Kanbach, D. A. Kniffen, Y. C. Lin, J. R. Mattox, et al.
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- 1 October 1994
- Published by American Astronomical Society in The Astrophysical Journal
Search of the energetic gamma-ray experiment telescope (EGRET) data for high-energy gamma-ray microsecond bursts
by C. E. Fichtel, D. L. Bertsch, B. L. Dingus, J. A. Esposito, R. C. Hartman, S. D. Hunter, G. Kanbach, D. A. Kniffen, Y. C. Lin, J. R. Mattox, et al.
Cited by 34
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Cited by 35
- 1 May 1994
- Published by American Astronomical Society in The Astrophysical Journal
A study of M31, M87, NGC 253, and M82 in high-energy gamma rays
by P. Sreekumar, D. L. Bertsch, B. L. Dingus, J. A. Esposito, C. E. Fichtel, R. C. Hartman, S. D. Hunter, G. Kanbach, D. A. Kniffen, Y. C. Lin, et al.
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- 1 May 1994
- Published by American Astronomical Society in The Astrophysical Journal
A study of M31, M87, NGC 253, and M82 in high-energy gamma rays
by P. Sreekumar, D. L. Bertsch, B. L. Dingus, J. A. Esposito, C. E. Fichtel, R. C. Hartman, S. D. Hunter, G. Kanbach, D. A. Kniffen, Y. C. Lin, et al.
Cited by 35
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Cited by 26
- 1 September 1993
- Published by American Astronomical Society in The Astrophysical Journal
Observation of high-energy gamma rays from the quasi-stellar object CTA 102
by P. L. Nolan, D. L. Bertsch, C. E. Fichtel, R. C. Hartman, S. D. Hunter, G. Kanbach, D. A. Kniffen, Y. C. Lin, J. R. Mattox, H. A. Mayer-Hasselwander, et al.
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- 1 September 1993
- Published by American Astronomical Society in The Astrophysical Journal
Observation of high-energy gamma rays from the quasi-stellar object CTA 102
by P. L. Nolan, D. L. Bertsch, C. E. Fichtel, R. C. Hartman, S. D. Hunter, G. Kanbach, D. A. Kniffen, Y. C. Lin, J. R. Mattox, H. A. Mayer-Hasselwander, et al.
Cited by 26

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