Fig. 1.
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Rate and spectral states of all six X-ray bursts. Top panel: Swift/BAT (red, 15−50 keV) and MAXI/GSC (blue, 2−20 keV) light curves of 4U 1636–536 in units of Crab rate. The arrows represent six X-ray bursts observed by NICER. Bottom panel: HID from NICER observations. All bursts are removed, and each point represent a segment of 64 s. The HID of the persistent emission prior to each X-ray burst has been marked as black square. We focus on bursts #4 and #5.
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