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We present detailed analysis of the transient X-ray source 2XMMiJ003833.3+402133 detected by XMM-Newton in January 2008 during a survey of M31. The X-ray spectrum is well fitted by either a steep power law plus ablackbody model or a double blackbody model. Prior observations withXMM-Newton, Chandra, Swift and ROSAT spanning 1991 to 2007, as well as anadditional Swift observation in 2011, all failed to detect this source. Nocounterpart was detected in deep optical imaging with the Canada France HawaiiTelescope down to a 3sigma lower limit of g = 26.5 mag. This source haspreviously been identified as a black hole X-ray binary in M 31. While thisremains a possibility, the transient behaviour, X-ray spectrum, and lack of anoptical counterpart are equally consistent with a magnetar interpretation for2XMMi J003833.3+402133. The derived luminosity and blackbody emitting radius atthe distance of M 31 argue against an extragalactic location, implying that ifit is indeed a magnetar it is located within the Milky Way but 22deg out of theplane. The high Galactic latitude could be explained if 2XMMi J003833.3+402133were an old magnetar, or if its progenitor was a runaway star that traveledaway from the plane prior to going supernova.

The X-ray Transient 2XMMi J003833.3+402133: A Candidate Magnetar at High Galactic Latitude