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GRB 060218/SN 2006aj: A Gamma-Ray Burst and Prompt Supernova at z=0.0335

N. MirabalDepartment of Astronomy, University of Michigan, Ann Arbor, MI 48109-1090J. P. HalpernDepartment of Astronomy, Columbia University, 550 West 120th Street, New York, NY 10027Deokkeun AnDepartment of Astronomy, Ohio State University, Columbus, OH 43210J. R. ThorstensenDepartment of Physics and Astronomy, Dartmouth College, 6127 Wilder Laboratory, Hanover, NH 03755-3528D. M. TerndrupDepartment of Astronomy, Ohio State University, Columbus, OH 43210

2006en

ABI

Annotatsiya

We report the imaging and spectroscopic localization of GRB 060218 to a low-metallicity dwarf starburst galaxy at z = 0.03345 ± 0.00006. In addition to making it the second nearest gamma-ray burst known, optical spectroscopy reveals the earliest detection of weak, supernova-like Si II near 5720 Å (~0.1c), starting 1.95 days after the burst trigger. UBVRI photometry obtained between 1 and 26 days postburst confirms the early rise of supernova light, and suggests a short time delay between the gamma-ray burst and the onset of SN 2006aj if the early appearance of a soft component in the X-ray spectrum is understood as a "shock breakout." Together, these results verify the long-hypothesized origin of soft gamma-ray bursts in the deaths of massive stars.

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Identifikatorlar

DOI: 10.13016/m21cy4-wykd

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