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After two major outbursts in 2006 and 2011, on 2017 May 16 the magnetar CXOUJ164710.2-455216, hosted within the massive star cluster Westerlund I, emitteda short (20 ms) burst, which marked the onset of a new active phase. We starteda long-term monitoring campaign with Swift (45 observations), Chandra (5observations) and NuSTAR (4 observations) from the activation until 2018 April.During the campaign, Swift BAT registered the occurrence of multiple bursts,accompanied by two other enhancements of the X-ray persistent flux. The longtime span covered by our observations allowed us to study the spectral as wellas the timing evolution of the source. After 11 months since the 2017 Mayoutburst onset, the observed flux was about 15 times higher than its historicalminimum level and a factor of 3 higher than the level reached after the 2006outburst. This suggests that the crust has not fully relaxed to the quiescentlevel, or that the source quiescent level has changed following the multipleoutburst activities in the past 10 years or so. This is another case ofmultiple outbursts from the same source on a yearly time scale, a somehowrecently discovered behaviour in magnetars.

The multi-outburst activity of the magnetar in Westerlund I