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A NICER Thermonuclear Burst from the Millisecond X-Ray Pulsar SAX J1808.4–3658
Astrophysical Journal Letters
The Neutron Star Interior Composition Explorer (NICER) has extensively monitored the August 2019 outburst of the 401 Hz millisecond X-ray pulsar SAX J1808.4-3658. In this Letter, we report on the detection of a bright helium-fueled Type I X-ray burst. With a bolometric peak flux of (2.3±0.1)× 10^-7 erg/cm^2/s, this was the brightest X-ray burst among all bursting sources observed with NICER to date. The burst shows a remarkable two-stage evolution in flux, emission lines at 1.0 keV and 6.7 keV,doi:10.3847/2041-8213/ab4ae1 fatcat:ng3uvaik7zeopdldge2322e5qu