SGR J1550–5418 BURSTS DETECTED WITH THE FERMI GAMMA-RAY BURST MONITOR DURING ITS MOST PROLIFIC ACTIVITY

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dc.citation.issueNumber122en_US
dc.citation.journalTitleThe Astrophysical Journalen_US
dc.citation.volumeNumber749en_US
dc.contributor.authorVan Der Horst, A.J.en_US
dc.contributor.authorKouveliotou, C.en_US
dc.contributor.authorGorgone, N.M.en_US
dc.contributor.authorKaneko, Y.en_US
dc.contributor.authorBaring, M.G.en_US
dc.contributor.authorGuiriec, S.en_US
dc.contributor.authorGogus, E.en_US
dc.contributor.authorGranot, J.en_US
dc.contributor.authorWatts, A.L.en_US
dc.contributor.authorLin, L.en_US
dc.contributor.authorBhat, P.N.en_US
dc.contributor.authorBissaldi, E.en_US
dc.contributor.authorChaplin, V.L.en_US
dc.contributor.authorFinger, M.H.en_US
dc.contributor.authorGehrels, N.en_US
dc.contributor.authorGibby, M.H.en_US
dc.contributor.authorGiles, M.M.en_US
dc.contributor.authorGoldstein, A.en_US
dc.contributor.authorGruber, D.en_US
dc.contributor.authorHarding, A.K.en_US
dc.contributor.authorKaper, L.en_US
dc.contributor.authorVon Kienlin, A.en_US
dc.contributor.authorVan Der Klis, M.en_US
dc.contributor.authorMcBreen, S.en_US
dc.contributor.authorMcenery, J.en_US
dc.contributor.authorMeegan, C.A.en_US
dc.contributor.authorPaciesas, W.S.en_US
dc.contributor.authorPe'er, A.en_US
dc.contributor.authorPreece, R.D.en_US
dc.contributor.authorRamirez-Ruiz, E.en_US
dc.contributor.authorRau, A.en_US
dc.contributor.authorWachter, S.en_US
dc.contributor.authorWilson-Hodge, C.en_US
dc.contributor.authorWoods, P.M.en_US
dc.contributor.authorWijers, R.A.M.en_US
dc.date.accessioned2013-03-13T18:41:30Zen_US
dc.date.available2014-03-19T05:10:03Zen_US
dc.date.issued2012en_US
dc.description.abstractWe have performed detailed temporal and time-integrated spectral analysis of 286 bursts from SGR J1550−5418 detected with the Fermi Gamma-ray Burst Monitor (GBM) in 2009 January, resulting in the largest uniform sample of temporal and spectral properties of SGR J1550−5418 bursts. We have used the combination of broadband and high time-resolution data provided with GBM to perform statistical studies for the source properties.We determine the durations, emission times, duty cycles, and rise times for all bursts, and find that they are typical of SGR bursts. We explore various models in our spectral analysis, and conclude that the spectra of SGR J1550−5418 bursts in the 8–200 keV band are equally well described by optically thin thermal bremsstrahlung (OTTB), a power law (PL) with an exponential cutoff (Comptonized model), and two blackbody (BB) functions (BB+BB). In the spectral fits with the Comptonized model, we find a mean PL index of −0.92, close to the OTTB index of −1. We show that there is an anti-correlation between the Comptonized Epeak and the burst fluence and average flux. For the BB+BB fits, we find that the fluences and emission areas of the two BB functions are correlated. The low-temperature BB has an emission area comparable to the neutron star surface area, independent of the temperature, while the hightemperature BB has a much smaller area and shows an anti-correlation between emission area and temperature.We compare the properties of these bursts with bursts observed from other SGR sources during extreme activations, and discuss the implications of our results in the context of magnetar burst models.en_US
dc.embargo.terms1 yearen_US
dc.identifier.citationVan Der Horst, A.J., Kouveliotou, C., Gorgone, N.M., et al.. "SGR J1550–5418 BURSTS DETECTED WITH THE FERMI GAMMA-RAY BURST MONITOR DURING ITS MOST PROLIFIC ACTIVITY." <i>The Astrophysical Journal,</i> 749, no. 122 (2012) The American Astronomical Society: http://dx.doi.org/10.1088/0004-637X/749/2/122.en_US
dc.identifier.doihttp://dx.doi.org/10.1088/0004-637X/749/2/122en_US
dc.identifier.urihttps://hdl.handle.net/1911/70562en_US
dc.language.isoengen_US
dc.publisherThe American Astronomical Societyen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.subject.keywordpulsarsen_US
dc.subject.keywordSGR J1550-5418en_US
dc.subject.keyword1E 1547.0-5408en_US
dc.subject.keywordPSR J1550-5418en_US
dc.subject.keywordstars: neutronen_US
dc.titleSGR J1550–5418 BURSTS DETECTED WITH THE FERMI GAMMA-RAY BURST MONITOR DURING ITS MOST PROLIFIC ACTIVITYen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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