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We discuss in this Letter the energetics of large gamma-ray superflaresobserved from Soft-Gamma Repeater sources. The last recorded event has in factruled out some models for the energy release. For the first time actualinformation about a possible associated gravitational wave emission may begathered from the LIGO data, even in the case that most of the energy wasemitted in gamma-rays. Even upper limits on the amplitude of the latter $h$ atthe expected frequency $f_{c} \leq 2 kHz$ may be useful to further constrainthe remaining mechanismsComment: To appear in Mod. Phys. Lett. A - Two broadband detectors apparently  online at the time of the event. Due to more restrictive criteria and  slightly different assumptions the figures reported here may differ from  actual ones by a small numerical factor. Related paper by Drago, Pagliara and  Berezhani added to reference

ENERGETICS OF THE SUPERFLARE FROM SGR1806-20 AND A POSSIBLE ASSOCIATED GRAVITATIONAL WAVE BURST