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

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dc.citation.firstpage150en_US
dc.citation.journalTitleThe Astrophysical Journalen_US
dc.citation.lastpage161en_US
dc.citation.volumeNumber755en_US
dc.contributor.authorVon Kienlin, Andreasen_US
dc.contributor.authorGruber, Daviden_US
dc.contributor.authorKouveliotou, Chryssaen_US
dc.contributor.authorGranot, Jonathanen_US
dc.contributor.authorBaring, Matthew G.en_US
dc.contributor.authorGogus, Ersinen_US
dc.contributor.authorHuppenkothen, Danielaen_US
dc.contributor.authorKaneko, Yukien_US
dc.contributor.authorLin, Linen_US
dc.contributor.authorWatts, Anna L.en_US
dc.contributor.authorBhat, Narayana P.en_US
dc.contributor.authorGuiriec, Sylvainen_US
dc.contributor.authorVan Der Horst, Alexander J.en_US
dc.contributor.authorBissaldi, Elisabettaen_US
dc.contributor.authorGreiner, Jochenen_US
dc.contributor.authorMeegan, Charles A.en_US
dc.contributor.authorPaciesas, William S.en_US
dc.contributor.authorPreece, Robert D.en_US
dc.contributor.authorRau, Arneen_US
dc.contributor.publisherThe American Astronomical Societyen_US
dc.date.accessioned2013-03-13T19:00:21Zen_US
dc.date.available2014-03-19T05:10:04Zen_US
dc.date.issued2012en_US
dc.description.abstractIn 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 8◦. Our spectral analysis indicates significant spectral evolution between the first and last set of events. Although the 2008 October events are best fitted with a single blackbody function, for the 2009 bursts an optically thin thermal bremsstrahlung is clearly preferred.We attribute this evolution to changes in the magnetic field topology of the source, possibly due to effects following the very energetic main bursting episode.en_US
dc.embargo.terms1 yearen_US
dc.identifier.citationVon Kienlin, Andreas, Gruber, David, Kouveliotou, Chryssa, et al.. "DETECTION OF SPECTRAL EVOLUTION IN THE BURSTS EMITTED DURING THE 2008–2009 ACTIVE EPISODE OF SGR J1550−5418." <i>The Astrophysical Journal,</i> 755, (2012) 150-161. http://dx.doi.org/10.1088/0004-637X/755/2/150.en_US
dc.identifier.doihttp://dx.doi.org/10.1088/0004-637X/755/2/150en_US
dc.identifier.urihttps://hdl.handle.net/1911/70566en_US
dc.language.isoengen_US
dc.subject.keywordpulsarsen_US
dc.subject.keywordindividual (SGR J1550−5418, 1E 1547.0−5408, PSR J1550−5418) – starsen_US
dc.subject.keywordneutron – X-raysen_US
dc.subject.keywordburstsen_US
dc.titleDETECTION OF SPECTRAL EVOLUTION IN THE BURSTS EMITTED DURING THE 2008–2009 ACTIVE EPISODE OF SGR J1550−5418en_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
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