Multi-wavelength data on GRB 260310A support an off-axis jet model explaining weak prompt emission and bright delayed afterglow, including reverse-shock signatures and late X-ray rebrightening.
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Off-axis cocoon emission from long GRB jets produces fast X-ray transients with luminosities of 10^47-48 erg/s, durations of 10-100 s, and soft quasi-thermal spectra peaking near 0.8 keV.
GRB intrinsic duration distributions show a redshift-dependent plateau only at z>2 and for soft bursts, indicating collapsar dominance at high redshift and non-collapsar contributions at low redshift, with progenitor radius constrained to a few tenths of a solar radius.
2D RMHD simulations show recollimation distance decreases monotonically with magnetization σ, converging to z_MHD/z_HD ∝ (B₀²/P_ext)^{-1/3} in the high-σ regime, with toroidal fields producing localized emission knots and poloidal fields shifting the zone downstream.
citing papers explorer
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An extremely bright slow-rising afterglow from an off-axis jet in GRB 260310A
Multi-wavelength data on GRB 260310A support an off-axis jet model explaining weak prompt emission and bright delayed afterglow, including reverse-shock signatures and late X-ray rebrightening.
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Fast X-ray Transients produced by Off-axis Jet-Cocoons from Long Gamma-Ray Bursts
Off-axis cocoon emission from long GRB jets produces fast X-ray transients with luminosities of 10^47-48 erg/s, durations of 10-100 s, and soft quasi-thermal spectra peaking near 0.8 keV.