I could not find any name for this dwarf galaxy. Recently galaxy NGC 4993 was searched by EM telescopes as a possible origin of GW, still unconfirmed by LIGO and Virgo interferometers. But it was searched.
Tullio

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A communicative beacon is only one of a range of possibilities, connected with intelligent activity. Galactic-scale engineering (Kardashev type III civilization) is another, spacecraft propulsion, yet another.

It's interesting to note that the individual pulses received in the new observations were relatively narrow in bandwidth, and occurred at a number of different frequencies. That doesn't sound particularly like evidence of a destructive, or chaotic natural process. Further analysis of the pulses may reveal some coherent pattern.