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Who is Sifter, and what is “the so-called Sifter flare”?

The BBC's Milky Way's centre exploded 3.5 million years ago says:

A cataclysmic energy flare ripped through our galaxy, the Milky Way, about 3.5 million years ago, a team of astronomers say.

They say the so-called Sifter flare started near the super massive black hole in the centre of the galaxy.

The impact was felt 200,000 light-years away.

[...]The flare created two enormous "ionisation cones" that sliced through the Milky Way.

It mentions "The team - led by Professor Joss Bland-Hawthorn from Australia" and "co-author Magma Guglielmo from the University of Sydney" and says "The findings will be published in the Astrophysical Journal."

Right now I'm just asking the following:

Question: Who is Sifter, and what is "the so-called Sifter flare"?