The Expected Thermal Precursors of Gamma-Ray Bursts in the Internal Shock Model

Details The Expected Thermal Precursors of Gamma-Ray Bursts in the Internal Shock Model The Expected Thermal Precursors of Gamma-Ray Bursts in the Internal Shock Model

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..662..289d&link_type=abstract

GAMMA-RAY BURST AND AFTERGLOW ASTRONOMY 2001: A Workshop Celebrating the First Year of the HETE Mission. AIP Conference Proceed

Astronomy and Astrophysics

Astronomy

Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

The prompt emission of GRBs probably comes from a highly relativistic wind which converts its kinetic energy into radiation via the formation of shocks within the wind itself. Such ``internal shocks'' can occur if the wind is generated with a highly non uniform distribution of the Lorentz factor. We estimate the expected thermal emission of such a relativistic wind when it becomes transparent. We compare this emission to the emission produced by internal shocks. In most cases we predict a rather bright thermal emission that could easily be detected. This favors wind acceleration mechanisms where the energy is initially injected in the form of magnetic rather than internal energy. Such scenarios can produce thermal X-ray precursors comparable to those observed by GINGA and WATCH/GRANAT.

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