G261.9+5.5 has only been cursorily studied, and the previous best radio image of this SNR dates back to the late 1980s. That image — from the Australian MOST observatory — has a very low signal-to-noise ratio, and shows a barely discernible ring of emission with hints of substructure. The new ASKAP image shows 943.5 MHz radio emission (synchrotron radiation) from the ~0.5° diameter remnant, and reveals filamentary substructure in the supernova shock front. This image is a selected part of a roughly 6° × 8° field observed as part of an ASKAP pilot survey and took 10 hours to observe.