雨燕时代的暗爆发：帕洛玛60英寸雨燕早期光学余辉目录
Dark Bursts in the Swift Era: The Palomar 60 inch-Swift Early Optical Afterglow Catalog
摘要：
我们提出了多色光学观测的长期伽马射线暴（GRB）的机器人帕洛玛60英寸望远镜（P60）在三年的时间。我们的样本包括斯威夫特发现的所有29个事件，P60在爆发触发后不到一小时就开始观测。我们能够从这个即时样本中恢复80%的光学余辉，我们将这种高效率归功于我们的红色覆盖。与Melandri等人（2008）一样，我们发现有相当一部分（约50%）的Swift事件显示出对X射线发射的光通量的抑制（所谓的“暗”爆发）。我们的多色测光表明，这可能在很大程度上是由于宿主星系的灭绝。我们认为，以前的研究，只选择最明亮和最好的采样光学余辉，显着低估了典型的伽玛射线暴环境中存在的尘埃量。
英文摘要：
We present multi-color optical observations of long-duration gamma-ray bursts (GRBs) made over a three year period with the robotic Palomar 60 inch telescope (P60). Our sample consists of all 29 events discovered by Swift for which P60 began observations less than one hour after the burst trigger. We were able to recover 80% of the optical afterglows from this prompt sample, and we attribute this high efficiency to our red coverage. Like Melandri et al. (2008), we find that a significant fraction (~ 50%) of Swift events show a suppression of the optical flux with regards to the X-ray emission (so-called "dark" bursts). Our multi-color photometry demonstrates this is likely due in large part to extinction in the host galaxy. We argue that previous studies, by selecting only the brightest and best-sampled optical afterglows, have significantly underestimated the amount of dust present in typical GRB environments.
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