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In this work, we explore the intriguing possibility of connectingself-interacting dark matter (SIDM) with the recently observed exceptionallybright and long-duration Gamma Ray Burst (GRB221009A). The proposed minimalscenario involves a light scalar mediator, simultaneously enabling dark matter(DM) self-interaction and explaining the observed very high energy (VHE)photons from GRB221009A reported by LHAASO's data. The scalar's mixing with thestandard model (SM) Higgs boson allows for its production at the GRB site,which will then propagate escaping attenuation by the extra-galactic backgroundlight (EBL). These scalars, if highly boosted, have the potential to explainLHAASO's data. Moreover, the same mixing also facilitates DM-nucleon orDM-electron scatterings at terrestrial detectors, linking SIDM phenomenology tothe GRB221009A events. This manuscript presents the parameter space meeting allconstraints and offers an exciting opportunity to explore SIDM in future directsearch experiments using insights from the GRB observation.

Self-interacting dark matter and the GRB221009A event