Discovery of the afterglow and host galaxy of the low redshift short GRB 080905A - Astrophysics > High Energy Astrophysical PhenomenaReport as inadecuate




Discovery of the afterglow and host galaxy of the low redshift short GRB 080905A - Astrophysics > High Energy Astrophysical Phenomena - Download this document for free, or read online. Document in PDF available to download.

Abstract: We present the discovery of short GRB 080905A, its optical afterglow and hostgalaxy. Initially discovered by Swift, our deep optical observations enabledthe identification of a faint optical afterglow, and subsequently a face-onspiral host galaxy underlying the GRB position, with a chance alignmentprobability of <1%. There is no supernova component present in the afterglow todeep limits. Spectroscopy of the galaxy provides a redshift of z=0.1218, thelowest redshift yet observed for a short GRB. The GRB lies offset from the hostgalaxy centre by ~18.5 kpc, in the northern spiral arm which exhibits an olderstellar population than the southern arm. No emission lines are visibledirectly under the burst position, implying little ongoing star formation atthe burst location. These properties would naturally be explained were theprogenitor of GRB 080905A a compact binary merger.



Author: A. Rowlinson, K. Wiersema, A. J. Levan, N. R. Tanvir, P. T. O'Brien, E. Rol, J. Hjorth, C. C. Thone, A. de Ugarte Postigo, J

Source: https://arxiv.org/







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