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We present nebular-phase spectra of the Type Ia supernova (SN Ia) 2016brx, amember of the 1991bg-like subclass that lies at the faint end of the SN Ialuminosity function. Nebular spectra are available for only three other1991bg-like SNe, and their Co line centers are all within <~ 500 km/s of eachother. In contrast, the nebular Co line center of SN 2016brx is blue-shifted by>1500 km/s compared to them and by ~1200 km/s compared to the rest frame. Thisis a significant shift relative to the narrow nebular line velocity dispersionof <~ 2000 km/s of these SNe. The large range of nebular line shifts impliesthat the Ni56 in the ejecta of SN 1991bg-like events is off-center by ~1000km/s rather than universally centrally confined as previously suggested. Withthe addition of SN 2016brx, the Co nebular line shapes of 1991bg-like objectsappear to connect with the brighter SNe Ia that show double-peak profiles,hinting at a continuous distribution of line profiles among SNe Ia. One classof models to produce both off-center and bi-modal Ni56 distributions iscollisions of white dwarfs with unequal and equal masses.

A Significantly off-center Ni56 Distribution for the Low-Luminosity Type Ia Supernova SN 2016brx from the 100IAS survey