Identifying and studying gamma-ray bursts at very high redshifts

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Gamma-ray bursts are bright enough to be seen to very high redshifts and their afterglows can provide redshifts and positions of their host galaxies, and in some cases details of the host ISM and the IGM close to the burst. Thus GRBs offer a unique probe of early star formation and the galaxy populations in the era of reionization. Our efforts to identify high-z GRBs were rewarded with the recent discovery of GRB 090423 at redshift 8.2. However, it remains the case that some good candidate high-z GRBs cannot be followed up quickly or deeply enough with ground-based IR spectroscopy, and indeed for others it is likely the Ly-alpha break falls in difficult regions of the IR spectrum. WFC3/IR on HST can obtain redshifts based on the location of the Ly-alpha break via slitless grism spectroscopy, to considerably deeper limits {and hence later times} than is possible from the ground, thus offering a solution to this problem. Our proposal aims to increase the efficiency of locating z>7 GRBs over the next three years by performing such spectroscopy on candidates for which photometry suggests they are very high redshift, but where the redshift can't be secured from the ground. We also propose to monitor the afterglows of any high-z GRBs found, and to perform an initial search for their hosts.;

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