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Figure 1: The model curves illustrate the difference in the 850 m evolution expected for a GRB that explodes in a wind-fed (Wind) or a constant density (ISM) circumburst medium. The models are taken from fits made to the cm radio, near-IR, optical, and X-ray data of GRB 980703 and redshifted to z = 1.5, which is typical for the GRBs observed to date (Frail et al. 2003a). The models only use a forward shock; an additional component from a reverse shock may also be present at early times. The  upper limits show all the 850 m GRB ToO observations made by SCUBA where no afterglow was detected. The filled triangles show the data for the new bursts presented in this paper. These new observations are starting to meaningfully sample the sub-millimeter emission at early times where there can be significant differences in the evolution of the sub-millimeter flux in the wind and ISM scenarios.

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