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The W30 complex consists of 7 Ultra-Compact HII regions and the SNR G8.7-0.1 at a distance of 6$\pm$1 kpc. The estimated age of the SNR is $\sim$ 10,000$-$50,000 years and the angular size is $\sim$ 1$^{\circ}$ implying a diameter of $\sim$ 90 pc. At the southwestern edge of the SNR is the young ($\sim$ 1.6$\times$10$^4$ yr) pulsar PSR 1800-21. The distance to the pulsar, based on the radio dispersion measure, is $\sim$ 4.5 kpc. The coincidences in space, on the sky, and in age of the SNR and pulsar have led to a suggested association (Kassim and Weiler, Nature, 343, 146 (1990)) of the two.
We present data from the Position Sensitive Proportional Counter (PSPC) onboard ROSAT acquired in 1992 while PSR 1800-21 was being observed. The pulsar was not detected but diffuse emission from the northern region of G8.7-0.1 was detected at a rate of $\sim$ 0.76 c/s. The X-ray morphology and the thermal parameters of the SNR, based on spectral modeling, and a discussion of the implications which this observation have for the suggested pulsar/SNR association will be presented.
