Are some short gamma-ray bursts associated with young progenitors?

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The host galaxy of the short-hard Gamma-Ray Burst GRB 050709 is a star-forming galaxy. This is contrary to the other two elliptical galaxies associated with short burts, and it has been argued that this implies a broad range of progenitor ages for the origins of the short bursts. This conclusion is very interesting, because it could argue for multiple kinds of progenitor systems for the short bursts. The stellar populations of the explosion sites is likely to be the only way to probe this issue until the era of the gravitational wave detectors. However, this conclusion is clearly also premature. That there are young stars in the host of GRB 050709 does not neccesarily mean that the progenitor was a young system. This proposal aims to investigate this matter by a detailed image in H-alpha ramp filter, to directly probe the star formation rate at the very explosion site which is known from previous HST imaging. We request a single HST orbit to probe the star formation rate down to 0.005 solarmasses per year, for this galaxy which is nearby emough z=0.16 to resolve the different star formation locations within the galaxy.

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