DETECTION OF SPECTRAL EVOLUTION IN THE BURSTS EMITTED DURING THE 2008-2009 ACTIVE EPISODE OF SGR J1550–5418

In early 2008 October, the soft gamma repeater SGR J1550-5418 (1E 1547.0-5408, AX J155052-5418, PSR J1550-5418) became active, emitting a series of bursts which triggered the Fermi Gamma-ray Burst Monitor (GBM) after which a second especially intense activity period commenced in 2009 January and a t...

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Bibliographic Details
Published in:The Astrophysical journal 2012-08, Vol.755 (2), p.1-11
Main Authors: von Kienlin, Andreas, Gruber, David, Kouveliotou, Chryssa, Granot, Jonathan, Baring, Matthew G, GOGUS, ERSIN, HUPPENKOTHEN, DANIELA, Kaneko, Yuki, Lin, Lin, Watts, Anna L
Format: Article
Language:English
Subjects:
Bursts
Emittance
Evolution
Gamma ray bursts
Monitors
Spectra
Spectral emittance
Temporal logic
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Summary:In early 2008 October, the soft gamma repeater SGR J1550-5418 (1E 1547.0-5408, AX J155052-5418, PSR J1550-5418) became active, emitting a series of bursts which triggered the Fermi Gamma-ray Burst Monitor (GBM) after which a second especially intense activity period commenced in 2009 January and a third, less active period was detected in 2009 March-April. Here, we analyze the GBM data for all the bursts from the first and last active episodes. We performed temporal and spectral analysis for all events and found that their temporal characteristics are very similar to the ones of other SGR bursts, as well the ones reported for the bursts of the main episode (average burst durations ~170 ms). In addition, we used our sample of bursts to quantify the systematic uncertainties of the GBM location algorithm for soft gamma-ray transients to [
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/755/2/150