Extended Tails from SGR 1806-20 Bursts
Ersin Gogus, Peter Woods, Chryssa Kouveliotou, Mark H. Finger,, Valentin Pal'shin, Yuki Kaneko, Sergei Golenetskii, Dmitry Frederiks, Carol, Airhart

TL;DR
This study analyzes extended X-ray tails following bursts from SGR 1806-20, revealing cooling blackbody spectra and differences in energy partitioning compared to other SGRs, prior to its 2004 giant flare.
Contribution
It provides detailed spectral and temporal analysis of X-ray tails from SGR 1806-20, highlighting differences in afterglow behavior and energy distribution compared to other soft gamma repeaters.
Findings
X-ray tails are consistent with cooling blackbody emission.
No significant change in pulsed X-ray amplitude post-burst.
Energy partitioning between burst and tail varies among SGRs.
Abstract
In 2004, SGR 1806-20 underwent a period of intense and long-lasting burst activity that included the giant flare of 27 December 2004 -- the most intense extra-solar transient event ever detected at Earth. During this active episode, we routinely monitored the source with Rossi X-ray Timing Explorer and occasionally with Chandra. During the course of these observations, we identified two relatively bright bursts observed with Konus-Wind in hard X-rays that were followed by extended X-ray tails or afterglows lasting hundreds to thousands of seconds. Here, we present detailed spectral and temporal analysis of these events observed about 6 and 1.5 months prior to the 27 December 2004 Giant Flare. We find that both X-ray tails are consistent with a cooling blackbody of constant radius. These spectral results are qualitatively similar to those of the burst afterglows recorded from SGR 1900+14…
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