X-ray Spectroscopy of Bursts from SGR 1806-20 with RXTE

Details X-ray Spectroscopy of Bursts from SGR 1806-20 with RXTE X-ray Spectroscopy of Bursts from SGR 1806-20 with RXTE

1998-02-02

arxiv.org/abs/astro-ph/9802023v1

Astronomy and Astrophysics

Astrophysics

5 pages, 5 figures, LaTeX AIP Proceedings article, to appear in the proceedings of the 4th BATSE Gamma-Ray burst workshop in H

Scientific paper

10.1063/1.55441

We report on new RXTE X-ray spectral analysis of bursts from SGR 1806-20, the most prolific SGR source known. Previous studies of bursts from this source revealed a remarkable lack of spectral variability both in single bursts as well as from burst to burst. We present here some of the first evidence for significant spectral evolution within SGR bursts. We find that optically thin thermal bremsstrahlung (OTTB) spectra including photoelectric absorption provide the best fits to most bursts, however, other models (power law, Band GRB) can also produce statistically acceptable fits. We confirm the existence of a rolloff in the photon number spectrum below 5 keV.

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