Swift J1858.6-0814 with ULTRACAM on 2018 Nov 9

SUMMARY: Source shows two classes of variability; Sporadic, rapid, red flares and longer, blue oscillations. These characteristics resemble V404 Cyg.




Figure 1: A segment of the simultaneous ULTRACAM lightcurves, sampled at a best cycle time of 0.92 s. Representative error bars are shown to the left. The dashed- and dotted lines demarcate the times for the zoomed-in segments in Figures 2 and 3 respectively (below).





Figure 2: Zoom-in on a fast, red flare early in the observation. Lightcurves have been normalised to better show the colour.





Figure 3: Zoom-in on a longer, blue flare towards the middle of the observation. Lightcurves have been normalised to highlight the colour.