Se p 19 99 Burst Mechanisms in Hydrodynamics

ar X iv : a st ro - p h / 99 01 33 8 v 1 2 5 Ja n 19 99 Predictions for The Very Early Afterglow and The Optical Flash

According to the internal-external shocks model for γ-ray bursts (GRBs), the GRB is produced by internal shocks within a relativistic flow while the afterglow is produced by external shocks with the ISM. We explore the early afterglow emission. For short GRBs the peak of the afterglow will be delayed, typically, by few dozens of seconds after the burst. For long GRBs the early afterglow emissio...

ar X iv : a st ro - p h / 99 09 27 6 v 1 1 5 Se p 19 99 Hard Burst Emission from the Soft Gamma Repeater SGR 1900 + 14

We present evidence for burst emission from SGR 1900+14 with a power-law high energy spectrum extending beyond 500 keV. Unlike previous detections of high energy photons during bursts from SGRs, these emissions are not associated with high-luminosity burst intervals. Not only is the emission hard, but the spectra are better fit by Band’s GRB function rather than by the traditional optically-thi...

ar X iv : a st ro - p h / 99 09 27 6 v 3 2 9 Se p 19 99 Hard Burst Emission from the Soft Gamma Repeater SGR 1900 + 14

We present evidence for burst emission from SGR 1900+14 with a power-law high energy spectrum extending beyond 500 keV. Unlike previous detections of high energy photons during bursts from SGRs, these emissions are not associated with high-luminosity burst intervals. Not only is the emission hard, but the spectra are better fit by Band’s GRB function rather than by the traditional optically-thi...

ep - t h / 99 09 12 3 v 1 1 7 Se p 19 99 Correct Treatment of 1 ( η · k ) p Singularities in the Axial Gauge Propagator Satish

ar X iv : h ep - p h / 99 08 40 5 v 2 1 6 Se p 19 99 April

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