Fig. 2

image

RXTE ASM and PCA light curves for Cir X-1 together with H.E.S.S. upper limits derived from individual ~ 28 min runs using standard event selection cuts. The blue shaded bands on the ASM light curve indicate the extent of the H.E.S.S. observations, while on the H.E.S.S. upper limit plots similar bands illustrate the duration of the contemporaneous PCA observations (OBS 1 − 3). The partitioning of OBS 3 into sub-intervals A−D based on 2−20 keV X-ray flux is illustrated in the bottom right panel. The plotted H.E.S.S. upper limits correspond to different threshold energies, and the vertical scale of each light curve has been optimised for the plotted data.

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