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We report for the first time below 1.5 keV, the detection of a secondary peakin an Eddington-limited thermonuclear X-ray burst observed by the Neutron StarInterior Composition Explorer (NICER) from the low-mass X-ray binary 4U1608-52. Our time-resolved spectroscopy of the burst is consistent with a modelconsisting of a varying-temperature blackbody, and an evolving persistent fluxcontribution, likely attributed to the accretion process. The dip in the burstintensity before the secondary peak is also visible in the bolometric flux.Prior to the dip, the blackbody temperature reached a maximum of $\approx3$keV. Our analysis suggests that the dip and secondary peak are not related tophotospheric expansion, varying circumstellar absorption, or scattering.Instead, we discuss the observation in the context of hydrodynamicalinstabilities, thermonuclear flame spreading models, and re-burning in thecooling tail of the burst.

NICER observes a secondary peak in the decay of a thermonuclear burst from 4U 1608-52