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Chrimes, A A; Levan, A J; Stanway, E R; Berger, E; Bloom, J S; Cenko, S B; Cobb, B E; Cucchiara, A; Fruchter, A S; Gompertz, B P; Hjorth, J; Jakobsson, P; Lyman, J D; O'Brien, P; Perley, D A; Tanvir, N R; Wheatley, P J; Wiersema, K
Monthly notices of the Royal Astronomical Society, 09/2019, Letnik: 488, Številka: 1Journal Article
The number of long gamma-ray bursts (GRBs) known to have occurred in the distant Universe (z>5) is small (∼15); however, these events provide a powerful way of probing star formation at the onset of galaxy evolution. In this paper, we present the case for GRB100205A being a largely overlooked high-redshift event. While initially noted as a high-z candidate, this event and its host galaxy have not been explored in detail. By combining optical and near-infrared Gemini afterglow imaging (at t < 1.3 d since burst) with deep late-time limits on host emission from the Hubble Space Telescope, we show that the most likely scenario is that GRB100205A arose in the range 4 < z<8. GRB100205A is an example of a burst whose afterglow, even at ∼1 h post burst, could only be identified by 8-m class IR observations, and suggests that such observations of all optically dark bursts may be necessary to significantly enhance the number of high-redshift GRBs known.
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