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The newly discovered supernova remnant G266.2-1.2 (RX J0852.0-4622), alongthe line of sight to the Vela SNR, was observed with ASCA for 120 ks. We findthat the X-ray spectrum is featureless, and well described by a power law,extending to three the class of shell-type SNRs dominated by nonthermal X-rayemission. Although the presence of the Vela SNR compromises our ability toaccurately determine the column density, the GIS data appear to indicateabsorption considerably in excess of that for Vela itself, indicating thatG266.2-1.2 may be several times more distant. An unresolved central source maybe an associated neutron star, though difficulties with this interpretationpersist.Comment: 4 pages, 5 figures, uses aipproc.sty & epsfig.sty. To appear in  "Young Supernova Remnants" (11th Annual Astrophysics Conference in Maryland),  S. S. Holt & U. Hwang (eds), AIP, New York (2001

Nonthermal X-ray emission from G266.2–1.2 (RX J0852.0–4622)