GRB 110715A: MULTIWAVELENGTH STUDY OF THE FIRST GAMMA-RAY BURST OBSERVED WITH ALMA

Gamma-ray Bursts: 15 Years of GRB Afterglows Pub Date : 2013-11-11 DOI:10.1051/EAS/1361042

R. Sánchez-Ramírez, P. Hancock, T. Murphy, A. U. Postigo, J. Gorosabel, D. A. Kann, C. Thöne, A. Lundgren, A. Kamble, S. Oates, J. Fynbo, I. D. G. Monsalvo, D. Garcia-Appadoo, S. Martín, N. Kuin, J. Greiner, A. Castro-Tirado

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Abstract

GRB 110715A had a bright afterglow that was obscured in the optical by a high Galactic extinction. We discovered the submillimeter counterpart with APEX and followed it in radio with ATCA for over 2 months. Additional submm observations were performed with ALMA as a test of the ToO procedures during commissioning, becoming the first GRB afterglow to be detected by the observatory. UV, optical and NIR observations were performed with Swift/UVOT and 2.2 m/GROND in La Silla and X-ray data were obtained by Swift/XRT. The dataset is complemented with spectroscopic data from the VLT/X-shooter spectrograph. The absorption features present in the intermediate resolution optical/nIR spectra reveal a redshift of 0.8224 and a host galaxy environment with low ionization. We fit in the host galaxy absorption features two velocity components separated by 30 km/s, implying a host galaxy with low dynamical activity. © EAS, EDP Sciences 2013.

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GRB 110715a:用Alma观测到的第一个伽马射线暴的多波长研究

GRB 110715A有一个明亮的余辉，在光学上被银河系的高消光所掩盖。我们用APEX发现了亚毫米的对应物，用ATCA在无线电中跟踪了2个多月。在调试期间，ALMA进行了额外的亚毫米观测，作为对ToO程序的测试，成为天文台探测到的第一个GRB余辉。利用Swift/UVOT和2.2 m/GROND进行紫外、光学和近红外观测，利用Swift/XRT获得x射线数据。该数据集还补充了VLT/ x射手光谱仪的光谱数据。中分辨率光学/近红外光谱的吸收特征显示其红移为0.8224，宿主星系环境为低电离。我们拟合了宿主星系吸收特征的两个速度分量，它们相距30 km/s，表明宿主星系具有较低的动力活动。©EAS, EDP Sciences 2013。

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Gamma-ray Bursts: 15 Years of GRB Afterglows

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