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We present X-ray observations of the new transient magnetar SwiftJ1834.9-0846, discovered with Swift BAT on 2011 August 7. The data wereobtained with Swift, RXTE, CXO, and XMM-Newton both before and after theoutburst. Timing analysis reveals singe peak pulsations with a period of 2.4823s and an unusually high pulsed fraction, 85+/-10%. Using the RXTE and CXO data,we estimated the period derivative, dot{P}=8\times 10^{-12} s/s, and confirmedthe high magnetic field of the source, B=1.4\times 10^{14} G. The decay of thepersistent X-ray flux, spanning 48 days, is consistent with a power law,t^{-0.5}. In the CXO/ACIS image, we find that the highly absorbed point sourceis surrounded by extended emission, which most likely is a dust scatteringhalo. Swift J1834.9-0846 is located near the center of the radio supernovaremnant W41 and TeV source HESS J1834-087. An association with W41 would implya source distance of about 4 kpc; however, any relation to the HESS sourceremains unclear, given the presence of several other candidate counterparts forthe latter source in the field. Our search for an IR counterpart of SwiftJ1834.9-0846 revealed no source down to K_s=19.5 within the 0.6' CXO errorcircle.

X-ray Observations of a New Unusual Magnetar Swift J1834.9-0846