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We present the first direct evidence for dense clumps of matter in thecompanion wind in a Supergiant Fast X-ray Transient (SFXT) binary. This is seenas a brief period of enhanced absorption during one of the bright, fast flaresthat distinguish these systems. The object under study was IGR J17544-2619, anda total of 236 ks of data were accumulated with the Japanese satellite Suzaku.The activity in this period spans a dynamic range of almost 10000 in luminosityand gives a detailed look at SFXT behavior.

IGR J17544-2619 in depth with Suzaku: direct evidence for clumpy winds in a supergiant fast X-ray transient