We report the discovery of PSR J1838 - 0537 , a gamma-ray pulsar found through a blind search of data from the Fermi Large Area Telescope ( LAT ) .
The pulsar has a spin frequency of 6.9 Hz and a frequency derivative of -2.2 \times 10 ^ { -11 } Hz s ^ { -1 } , implying a young characteristic age of 4970 years and a large spin-down power of 5.9 \times 10 ^ { 36 } erg s ^ { -1 } .
Follow-up observations with radio telescopes detected no pulsations , thus PSR J1838 - 0537 appears radio-quiet as viewed from Earth .
In September 2009 the pulsar suffered the largest glitch so far seen in any gamma-ray-only pulsar , causing a relative increase in spin frequency of about 5.5 \times 10 ^ { -6 } .
After the glitch , during a putative recovery period , the timing analysis is complicated by the sparsity of the LAT photon data , the weakness of the pulsations , and the reduction in average exposure from a coincidental , contemporaneous change in the LAT ’ s sky-survey observing pattern .
The pulsar ’ s sky position is coincident with the spatially extended TeV source HESS J1841 - 055 detected by the High Energy Stereoscopic System ( H.E.S.S . ) .
The inferred energetics suggest that HESS J1841 - 055 contains a pulsar wind nebula powered by the pulsar .