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We report the serendipitous discovery with XMM-Newton that 3XMMJ185246.6+003317 is an 11.56 s X-ray pulsar located 1' away from the southernboundary of supernova remnant Kes 79. The spin-down rate of 3XMMJ185246.6+003317 is $<1.1\times 10^{-13}$ s s$^{-1}$, which, together with thelong period P=11.558714(2) s, indicates a dipolar surface magnetic field of$<3.6\times 10^{-13}$ G, a characteristic age of $>1.7$ Myr, and a spin-downluminosity of $<2.8\times 10^{30}$ erg s$^{-1}$. The X-ray spectrum of thesource is best-fitted with a resonant Compton scattering model, and can be alsoadequately described by a blackbody model. The observations covering a sevenmonth span from 2008 to 2009 show variations in the spectral properties of thesource, with the luminosity decreasing from $2.7\times 10^{34}$ erg s$^{-1}$ to$4.6 \times 10^{33}$ erg s$^{-1}$, along with a decrease of the blackbodytemperature from $kT\approx 0.8$ keV to $\approx0.6$ keV. The X-ray luminosityof the source is higher than its spin-down luminosity, ruling out rotation as apower source. The combined timing and spectral properties, the non-detection ofany optical or infrared counterpart, together with the lack of detection of thesource in archival X-ray data prior to the 2008 XMM-Newton observation, pointto this source being a newly discovered transient low-B magnetar undergoing anoutburst decay during the XMM-Newton observations. The non-detection by Chandrain 2001 sets an upper limit $4\times 10^{32}$ erg s$^{-1}$ to the quiescentluminosity of 3XMM J185246.6+003317. Its period is the longest among currentlyknown transient magnetars. The foreground absorption toward 3XMMJ185246.6+003317 is similar to that of Kes 79, suggesting a similar distance of$\sim$7.1 kpc.

Discovery of the transient magnetar 3XMM J185246.6+003317 near supernova remnant Kesteven 79 with XMM-Newton