Isolating GRB Supernovae

Details Isolating GRB Supernovae Isolating GRB Supernovae

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3730f&link_type=abstract

Spitzer Proposal ID #3730

Physics

Scientific paper

It is now thought likely that most, if not all, long-duration gamma-ray bursts (GRBs) harbor a supernova under their bright multi-wavelength afterglows. The supernovae, like the afterglows, however, can vary substantially in brightness, and in most cases are largely overwhelmed by the synchrotron radiation from the GRB fireball. Here we propose to observe nearby (z < 0.4) GRBs at one, two and three weeks after burst in the rest frame using IRAC. In the 3 -- 8 micron region of the spectrum the power-law afterglow of the GRB will be essentially uncontaminated by the supernova, permitting an accurate measurment of the magitude and spectral-slope of the afterglow. Late-time observations in the same spectral range will permit us to remove any effect of the host galaxy, as well as any confusing backround, from the early-time measurments. These observations will allow a relatively clean subtraction of the afterglow from the total light of the GRB, dramatically increasing the contrast between the afterglow and the supernova, and allowing a study of the physical properties of the progenitors of these most extraordinary bursts.

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