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We present an analysis of the extreme obscuration variability observed during an  XMM–Newton  5‐d continuous monitoring of the active galactic nuclei (AGN) in NGC 1365. The source was in a reflection‐dominated state in the first ∼1.5 d, then a strong increase in the 7–10 keV emission was observed in ∼10 h, followed by a symmetric decrease. The spectral analysis of the different states clearly shows that this variation is due to an uncovering of the X‐ray source. From this observation, we estimate a size of the X‐ray source   D  S  &lt; 10 13   cm, a distance of the obscuring clouds   R ∼ 10 16  cm  and a density   n ∼ 10 11  cm −3  . These values suggest that the X‐ray absorption/reflection originates from the broad‐line region clouds. This is also supported by the resolved width of the iron narrow   K α  emission line, consistent with the width of the broad Hβ line.

The XMM–Newton long look of NGC 1365: uncovering of the obscured X‐ray source