  Recent ASCA observations of G347.3-0.5, an SNR discovered in the ROSAT
All-Sky Survey, reveal nonthermal emission from a region along the northwestern
shell (Koyama et al. 1997). Here we report on new pointed ASCA observations of
G347.3-.5 which confirm this result for all the bright shell regions and also
reveal similar emission, although with slightly different spectral properties,
from the remainder of the SNR. Curiously, no thermal X-ray emission is detected
anywhere in the remnant. We derive limits on the amount of thermal emitting
material present in G347.3-0.5 and present new radio continuum, CO and infrared
results which indicate that the remnant is distant and of moderate age. We show
that our observations are broadly consistent with a scenario that has most of
the supernova remnant shock wave still within the stellar wind bubble of its
progenitor star, while part of it appears to be interacting with denser
material. A point source at the center of the remnant has spectral properties
similar to those expected for a neutron star and may represent the compact
relic of the supernova progenitor.
