Scientific and Technical Aerospace Reports Volume 39 April 6, 2001

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SPACE RADIATION
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20010021859 NASA Marshall Space Flight Center, Huntsville, AL USA
Temporal Characteristics of SGR 1806-20 and SGR 1900+14 Bursts
Gogus, Ersin, NASA Marshall Space Flight Center, USA; Kouveliotou, Chryssa, NASA Marshall Space Flight Center, USA;
Woods, Peter M., NASA Marshall Space Flight Center, USA; Thompson, Christopher, NASA Marshall Space Flight Center,
USA; Duncan, Robert C., NASA Marshall Space Flight Center, USA; Briggs, Michael S., NASA Marshall Space Flight Center,
USA; [2000]; 1p; In English; No Copyright; Avail: Issuing Activity; Abstract Only
We study the temporal properties of 268 bursts from SGR 1806$-$20 and 679 bursts from SGR 1900+14 all observed with
the Rossi X-Ray Timing Explorer/Proportional Counter Array. Temporal parameters, such as T$_{90}$ durations and
$\tau$$_{90}$ emission times are implemented. We find a lognormal distribution of burst durations, ranging over more than two
orders of magnitude: T$_{90}$ $\sims$ 10$ {-2}$ to $\gtrsim$ 1 s, with a peak $\sim$ 0.1 s. The burst light curves tend to be
asymmetrical, with more than half of all events showing rise times t$_{r}$ $ 900 km/s),
low ionization level [OIII]lambda5007/Hbeta approximately 2-4 and weak HeII.lambda4686/Hbeta is less than or equal to 0.07,
together with a narrow component (is less than = few hundred km/s) with higher ionization level and strong HeII emission (HeII/
Hbeta approximately 0.5)
Author
Kinematics; Radio Galaxies; Red Shift
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