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Güver, Tolga; Gö ü, Ersin; Vurgun, Eda; Enoto, Teruaki; Gendreau, Keith C.; Sakamoto, Takanori; Gotthelf, Eric V.; Arzoumanian, Zaven; Guillot, Sebastien; Jaisawal, Gaurava K.; Malacaria, Christian; Majid, Walid A.
Astrophysical journal. Letters, 06/2019, Letnik: 877, Številka: 2Journal Article
We present the earliest available soft X-ray observations of XTE J1810−197, the prototypical transient magnetar, obtained 75-84 days after its 2018 outburst with the Neutron Star Interior Composition Explorer. Using a series of observations covering eight days we find that its decreasing X-ray flux is well described by either a blackbody plus power law or a two-blackbody spectral model. The 2-10 keV flux of the source varied from (1.206 0.007) × 10−10 to , a decrease of about 7% within our observations and 44% from that measured 7-14 days after the outburst with NuSTAR. We confirm that the pulsed fraction and spin pulse phase of the neutron star are energy dependent up to at least 8 keV. Phase-resolved spectroscopy of the pulsar suggests magnetospheric variations relative to the line of sight.
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