Dash was introduced around 1955 or 1956 I think. Burst, being an enzyme product was introduced by Colgate Palmolive in 1967 or so. That is around when all the big enzyme products came out - Gain from P&G, Punch from Colgate (but it wasn't a concentrated powder like Burst), Drive from Lever Brothers and Brillo from Purex. Also, other detergents began including enzymes - Dash, Tide XK, Oxydol, Bold, Fab, Ajax, Cold Power. Not every detergent had enzymes though - Lever didn't use them in Surf, any of its All products (3Bs, Fluffy All, Liquid all or Cold Water All powder, Rinso, Silver Dust, Wisk or Breeze, P&G didn't use them in Cheer or Bonus (short lived anyway), Duz detergent or Duz soap and Colgate didn't use them in AD. Of course, by 1972, enzyme detergents along with phosphates were on the way out thanks to the crazed environmentalists so a few of those products like Brillo and Burst didn't actually last that long..
The detergent makers used that as a way to pare down their offerings removing slow moving products like Silver Dust, Rinso Blue, Rinso with Color Bleach, Bonus, AD etc...
I recall Burst smelled a lot like the original Fab which had already moved to its " lemon freshened Borax" formula so Colgate just recycled the fragrance into Burst. Wasn't a bad product, but without its enzymes wasn't any more remarkable than what was already on the shelves.