NICER observations of the 2018 outburst of XTE J1810-197
Güver, Tolga and Göğüş, Ersin and Vurgun, Eda and Enoto, Teruaki and Gendreau, Keith C. and Sakamoto, Takanori and Gotthelf, Eric V. and Arzoumanian, Zaven and Guillot, Sebastien and Jaisawal, Gaurava K. and Malacaria, Christian and Majid, Walid A. (2019) NICER observations of the 2018 outburst of XTE J1810-197. Astrophysical Journal Letters, 877 (2). ISSN 2041-8205 (Print) 2041-8213 (Online)
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Official URL: http://dx.doi.org/10.3847/2041-8213/ab212d
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) x 10(-10) to (1.125 +/- 0.004) x 10(-10) erg s(-1) cm(-2), 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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