Nakagawa 2008 SGR 1900+14最近几年爆发的X射线余辉观测

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arXiv:0806.0099 [ps, pdf, other]

Title: The Swift Discovery of X-ray Afterglows Accompanying Short Bursts from SGR 1900+14

Authors: Y. E. Nakagawa, T. Sakamoto, G. Sato, N. Gehrels, K. Hurley, D. M. Palmer

Comments: 12 pages, 3 figures, 3 tables, accepted for publication in ApJL

Subjects: Astrophysics (astro-ph)

The discovery of X-ray afterglows accompanying two short bursts from SGR 1900+14 is presented. The afterglow luminosities at the end of each observation are lower by 30-50% than their initial luminosities, and decay with power law indices p ~ 0.2-0.4. Their initial bolometric luminosities are L ~ 10^34-10^35 erg s^-1. We discuss analogies and differences between the X-ray afterglows of SGR short bursts and short gamma-ray bursts.