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EGRET/COMPTEL Observations of an Unusual, Steep-Spectrum Gamma-Ray SourceDuring analysis of sources below the threshold of the third EGRET catalog, we have discovered a source, named GRO J1400-3956 based on the best position, with a remarkably steep spectrum. Archival analysis of COMPTEL data shows that the spectrum must have a strong turn-over in the energy range between COMPTEL and EGRET. The EGRET data show some evidence of time variability, suggesting an AGN, but the spectral change of slope is larger than that seen for most gamma-ray blazars. The sharp cutoff resembles the high-energy spectral breaks seen in some gamma-ray pulsars. There have as yet been no OSSE observations of this source.
Document ID
20000026343
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Thompson, D. J. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Bertsch, D. L. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Hartman, R. C. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Collmar, W. (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Johnson, W. N. (Naval Research Lab. United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1999
Publication Information
Publication: EGRET Team Papers to be Published in the Proceedings of the Fifth Compton Symposium
Subject Category
Space Radiation
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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IDRelationTitle20000026337Collected WorksEGRET Team Papers to Be Published in the Proceedings of the Fifth Compton Symposium
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