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GRB 010921: STRONG LIMITS ON AN UNDERLYING SUPERNOVA FROM THE HUBBLE SPACE TELESCOPE

机译:GRB 010921:从哈勃太空望远镜对基本超新星的严格限制

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摘要

GRB 010921 was the first HETE-2 gamma-ray burst (GRB) to be localized via its afterglow emission. The low redshift of the host galaxy, z = 0.451, prompted us to undertake intensive multicolor observations with the Hubble Space Telescope with the goal of searching for an underlying supernova (SN) component. We do not detect any coincident SN to a limit 1.33 mag fainter than SN 1998bw at 99.7% confidence, making this one of the most sensitive searches for an underlying SN. Analysis of the afterglow data allows us to infer that the GRB was situated behind a net extinction (Milky Way and the host galaxy) of Ay ~ 1.8 mag in the observer frame. Thus, had it not been for such heavy extinction, our data would have allowed us to probe for an underlying SN with brightness approaching those of more typical Type Ib/c SNe.
机译:GRB 010921是第一个通过余辉发射定位的HETE-2伽马射线暴(GRB)。主星系的低红移z = 0.451,促使我们用哈勃太空望远镜进行了密集的多色观测,目的是寻找潜在的超新星(SN)分量。我们没有以99.7%的置信度检测到比SN 1998bw弱1.33 mag的重合SN,这使其成为对基础SN最敏感的搜索之一。通过对余辉数据的分析,我们可以推断出GRB位于观察者框架内Ay〜1.8 mag的净灭绝(银河系和宿主星系)之后。因此,如果没有发生如此严重的灭绝事件,我们的数据将使我们能够探查潜在的SN,其亮度接近更典型的Ib / c SNe型。

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