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In 2013 April a new magnetar, SGR 1745-2900, was discovered as it entered anoutburst, at only 2.4 arcsec angular distance from the supermassive black holeat the Centre of the Milky Way, Sagittarius A*. SGR 1745-2900 has a surfacedipolar magnetic field of ~ 2x10^{14} G, and it is the neutron star closest toa black hole ever observed. The new source was detected both in the radio andX-ray bands, with a peak X-ray luminosity L_X ~ 5x10^{35} erg s^{-1}. Here wereport on the long-term Chandra (25 observations) and XMM-Newton (8observations) X-ray monitoring campaign of SGR 1745-2900, from the onset of theoutburst in April 2013 until September 2014. This unprecedented dataset allowsus to refine the timing properties of the source, as well as to study theoutburst spectral evolution as a function of time and rotational phase. Ourtiming analysis confirms the increase in the spin period derivative by a factorof ~2 around June 2013, and reveals that a further increase occurred between2013 Oct 30 and 2014 Feb 21. We find that the period derivative changed from6.6x10^{-12} s s^{-1} to 3.3x10^{-11} s s^{-1} in 1.5 yr. On the other hand,this magnetar shows a slow flux decay compared to other magnetars and a ratherinefficient surface cooling. In particular, starquake-induced crustal coolingmodels alone have difficulty in explaining the high luminosity of the sourcefor the first ~200 days of its outburst, and additional heating of the starsurface from currents flowing in a twisted magnetic bundle is probably playingan important role in the outburst evolution.

The X-ray outburst of the Galactic Centre magnetar SGR J1745-2900 during the first 1.5 year