A fundamental test of the fireball model for GRBs

Details A fundamental test of the fireball model for GRBs A fundamental test of the fireball model for GRBs

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008xmm..prop...46s&link_type=abstract

XMM-Newton Proposal ID #06018402

Physics

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, Grb1, Grb1

Scientific paper

The most extreme GRBs radiate equivalent isotropic energies close to 1E54 erg; energies which cannot be accommodated in core-collapse models. Thus GRBs are thought to be narrowly beamed, which should give rise to an achromatic light curve break as the outflow slows and the Doppler beaming angle becomes of the same order as the jet opening angle. However, observations with Swift have not been able to securely identify light curve breaks leading to serious concerns about the total energetics which may undermine the entire GRB paradigm. We seek observations totalling 120 ks to test for the absence of such breaks in the X-ray light curves of two further highly energetic GRBs, continuing our campaign to use the most extreme sources in the GRB population to re-examine the widely accepted GRB core-collapse models.

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