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 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007xmm..prop..180s&link_type=abstract

XMM-Newton Proposal ID #05559702

Physics

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, Grb1, Grb1, Xmm-Newton Proposal Id #05559702

Scientific paper

The most extreme GRBs radiate equivalent isotropic energies close to 10^54 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 suggest such jet breaks are absent, leading to concerns about the total energetics which may undermine the entire GRB paradigm. We seek XMM-Newton observations to test for the absence of breaks in the X-ray light curves of two highly energetic GRBs. If even one is found with no break at late times, then the whole class of core-collapse models for GRBs will be thrown into serious doubt.

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