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Fig. 1

image

Light curve of the 2015 outburst observed from IGR J00291+5934. We show data from Swift/XRT (green circles, bin time of 500 s; July 24–15 August), Swift/BAT (black triangles, each measurement is averaged over 1 d; July 11–28 August), and INTEGRAL/ISGRI (red squares, the integration time is one science window of ~2–3 ks; July 27–29). The arrow indicates the time of the only detected type-I X-ray burst. The dashed line shows the quiescent flux level. The source outburst reaches the highest peak flux that has ever been detected in the previous outbursts.

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