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

N. Mirabal·J. P. Halpern·D. An·J. R. Thorstensen·D. M. Terndrup
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Abstract

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 Angstroms (0.1c), starting 1.95 days after the burst trigger. UBVRI photometry obtained between 1 and 26 days post-burst 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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N. Mirabal, J. P. Halpern, D. An, J. R. Thorstensen, D. M. Terndrup. 2006-05-22. GRB 060218/SN 2006aj: A Gamma-Ray Burst and Prompt Supernova at z=0.0335. https://doi.org/10.1086/505177

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