Lastest Results from the X-ray Monitoring Campaign of AXP CXOU J17145.7-381031 in CTB 37B

The 3.82 s AXP CXOU J17145.7-381031 in the supernova remnant CTB 37B has one of the largest spin-down powers for a magnetar, and it may be the youngest one as well. Magnetars with the greatest spin-down power are SGRs, and a marked increase in their spin-down torque often preceds an outburst. In this regard, AXP CXOU J17145.7-381031 is very similar to SGR/AXP 1E 1547.0-5408, the magnetar with the largest spin-down power. We will report on the latest timing and spectral results from our on-going Chandra and XMM X-ray monitoring campaign on the AXP in CTB 37B. We also present a NuSTAR observation that reveals a separate, hard spectral component similar to that found for other magnetars.