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Hard Burst Emission from the Soft Gamma Repeater SGR 1900+14We present evidence for burst emission from SGR 1900 + 14 with a power-law high-energy spectrum extending beyond 500 keV. Unlike previous detections of high-energy photons during bursts from soft gamma repeaters (SGRs), these emissions are not associated with extraordinarily bright flares. Not only is the emission hard, but the spectra are better fitted by D. Band's gamma-ray burst (GRB) function rather than by the traditional optically thin thermal bremsstrahlung model. We find that the spectral evolution within these hard events obeys a hardness/intensity anticorrelation. Temporally, these events are distinct from typical SGR burst emissions in that they are longer (approximately 1 s) and have relatively smooth profiles. Despite a difference in peak luminosity of approximately > 10(exp 11) between these bursts from SGR 1900 + 14 and cosmological GRBs, there are striking temporal and spectral similarities between the two kinds of bursts, aside from spectral evolution. We outline an interpretation of these events in the context of the magnetar model.
Document ID
20000033814
Acquisition Source
Marshall Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Woods, Peter M.
(Alabama Univ. Huntsville, AL United States)
Kouveliotou, Chryssa
(NASA Marshall Space Flight Center Huntsville, AL United States)
VanParadijs, Jan
(NASA Marshall Space Flight Center Huntsville, AL United States)
Briggs, Michael S.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Hurley, Kevin
(California Univ. Berkeley, CA United States)
Gogus, Ersin
(NASA Marshall Space Flight Center Huntsville, AL United States)
Preece, Robert D.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Giblin, Timothy W.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Thompson, Christopher
(North Carolina Univ. Chapel Hill, NC United States)
Duncan, Robert C.
(Texas Univ. Austin, TX United States)
Date Acquired
August 19, 2013
Publication Date
December 10, 1999
Publication Information
Publication: Astrophysical Journal
Publisher: American Astronomical Society
Volume: 527
Subject Category
Space Radiation
Funding Number(s)
CONTRACT_GRANT: NCC8-65
CONTRACT_GRANT: NAG5-3674
CONTRACT_GRANT: NAG5-7060
CONTRACT_GRANT: NAG5-7810
CONTRACT_GRANT: JPL-958056
Distribution Limits
Public
Copyright
Other

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