Self-consistent simulations reveal that reverse shocks in GRB photospheres stay radiation-mediated down to optical depths of a few tenths, with photons decoupling over a broad radial range and forming a quasi-thermal post-cursor.
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A second coherent radio burst spanning 704-4032 MHz with spectral index -2.18, 54% linear and 22% circular polarization, and an orthogonal polarization angle jump was detected from 2XMM J104608.7-594306, showing rare radio activity in sources thought to be radio-quiet.
Machine learning on precursor emission in 366 GRBs yields a simple prompt-only index EPI that separates merger-driven from collapsar-driven bursts at a threshold of 6.2.
The earliest 1.3 mm observations of GRB 260127A detect 6.9 mJy emission 12.6 minutes post-trigger with a later non-detection implying decline at least as fast as t^{-0.5}, consistent with forward or reverse shock scenarios.
Numerical modeling shows GRB 230307A's late-time prompt emission break is best reproduced by a jet with uniform core of 0.0147 rad and power-law wings, unlike simpler spherical or top-hat models.
Spectral width increases with time in GRB 220426A and GRB 230812B, challenging single-zone emission models and supporting multi-zone prompt emission.
GRB 110801A shows double-burst gamma-ray emission with an early-rising optical afterglow from the first burst preceding the second prompt episode, modeled via reverse and forward shocks yielding Gamma_0 ~60, theta_j ~0.09, and E_k,iso ~10^54.8 erg.
citing papers explorer
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From Internal Collision to Photon Escape: First-Principles Modeling of Radiation-Mediated Shocks in Gamma-Ray Burst Photospheres
Self-consistent simulations reveal that reverse shocks in GRB photospheres stay radiation-mediated down to optical depths of a few tenths, with photons decoupling over a broad radial range and forming a quasi-thermal post-cursor.
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A bright wideband radio burst from the isolated neutron star 2XMM J104608.7$-$594306
A second coherent radio burst spanning 704-4032 MHz with spectral index -2.18, 54% linear and 22% circular polarization, and an orthogonal polarization angle jump was detected from 2XMM J104608.7-594306, showing rare radio activity in sources thought to be radio-quiet.
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Identifying Merger-Driven and Collapsar-Driven Gamma-Ray Bursts with Precursor based Solely on Prompt Emission
Machine learning on precursor emission in 366 GRBs yields a simple prompt-only index EPI that separates merger-driven from collapsar-driven bursts at a threshold of 6.2.
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Rapid-response 1.3 mm Observations of GRB 260127A with the Submillimeter Array
The earliest 1.3 mm observations of GRB 260127A detect 6.9 mJy emission 12.6 minutes post-trigger with a later non-detection implying decline at least as fast as t^{-0.5}, consistent with forward or reverse shock scenarios.
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Jet-Structure Imprint on the Curvature Tail of Gamma-Ray Burst Prompt Emission
Numerical modeling shows GRB 230307A's late-time prompt emission break is best reproduced by a jet with uniform core of 0.0147 rad and power-law wings, unlike simpler spherical or top-hat models.
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Are Single-Zone Emission models Sufficient to Explain GRB 220426A and GRB 230812B?
Spectral width increases with time in GRB 220426A and GRB 230812B, challenging single-zone emission models and supporting multi-zone prompt emission.
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The Double-Burst Nature and Early Afterglow Evolution of Long GRB 110801A
GRB 110801A shows double-burst gamma-ray emission with an early-rising optical afterglow from the first burst preceding the second prompt episode, modeled via reverse and forward shocks yielding Gamma_0 ~60, theta_j ~0.09, and E_k,iso ~10^54.8 erg.