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We discuss the multiband energy release in a model of a collapsing galacticnucleus, and we try to interpret the unique super-long cosmic gamma-ray eventSwift J164449.3+573451 (GRB 110328A by early classification) in this scenario.Neutron stars and stellar-mass black holes can form evolutionary a compactself-gravitating subsystem in the galactic center. Collisions and merges ofthese stellar remnants during an avalanche contraction and collapse of thecluster core can produce powerful events in different bands due to severalmechanisms. Collisions of neutron stars and stellar-mass black holes cangenerate gamma-ray bursts (GRBs) similar to the ordinary models of short GRBorigin. The bright peaks during the first two days may also be a consequence ofmultiple matter supply (due to matter release in the collisions) and accretiononto the forming supermassive black hole. Numerous smaller peaks and laterquasi-steady radiation can arise from gravitational lensing, late accretion ofgas onto the supermassive black hole, and from particle acceleration by shockwaves. Even if this model will not reproduce exactly all the SwiftJ164449.3+573451 properties in future observations, such collapses of galacticnuclei can be available for detection in other events.

Swift J164449.3+573451 event: generation in the collapsing star cluster?