Multi-TeV ${\hat{I}}^3$-ray candidates from GRB 221009A: a downturn in the intrinsic ${\hat{I}}^3$-ray spectrum, an echo of the prompt emission phase, and intergalactic electromagnetic cascades

Timur A. Dzhatdoev, Jagdish C. Joshi, Abhijit Roy +2

The detection of ${\hat{I}}^3$-ray candidates up to the energy of $\approx$13 TeV from the exceptionally bright ${\hat{I}}^3$-ray burst GRB 221009A by the Large High Altitude Air-Shower Observatory…