THE ENERGETIC MAGNETAR IN HESS J1713-381/CTB 37B

The 3.82s AXP in the SNR CTB 37B is among the youngest and most energeticmagnetars, with a spindown power up to 7.4E34 erg/s. A recent NuSTARobservation reveals hard Xray emission above 10 keV. We propose to measure itshard spectrum with sufficient accuracy to apply the Beloborodov e/e+ outflowmodel and to characterize its >10 keV pulsed emission, to study the emissiongeometry. We also propose to continue monitoring its spindown rate, whichvaries by a factor of 2. The most energetic magnetars are SGRs, and a markedincrease in their spindown torque often precedes an outburst. By analogy withSGR/AXP 1E 1547.05408, the magnetar with the largest spindown power, and mostsimilar to the AXP in CTB 37B, we may be observing the behavior of an SGR before it outburst. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]