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GRB 080517: A local, low luminosity GRB in a dusty galaxy at z=0.09

By Elizabeth R. Stanway, Andrew J. Levan, Nial Tanvir, Klaas Wiersema, Alexander van der Horst, Carole G. Mundell and Cristiano Guidorzi

Abstract

We present an analysis of the photometry and spectroscopy of the host galaxy of Swift detected GRB080517. From our optical spectroscopy, we identify a redshift based on strong emission lines of z = 0.089 ± 0.003, making this a rare example of a very local long gamma ray burst. The galaxy is detected in the radio with a flux density of S4.5 GHz =0.22±0.04 mJy - one of relatively few known GRB hosts with a securely measured radio flux. Both optical emission lines and a strong detection at 22μm suggest that the host galaxy is forming stars rapidly, with an inferred star formation rate ∼ 16M yr−1 and a high dust obscuration (E(B − V ) > 1, based on sight-lines to the nebular emission regions). The presence of a companion galaxy within a projected distance of 25 kpc, and almost identical in redshift, suggests that star formation may have been triggered by galaxy-galaxy interaction. However, fitting of the remarkably flat spectral energy distribution from ultraviolet through to the infrared suggests that the ongoing star formation is underlain by an older, 500 Myr post-starburst stellar population. We suggest that that the host galaxy of GRB080517 provides a valuable local exemplar of the stellar populations giving rise to dusty, optically-faint bursts

Year: 2015
DOI identifier: 10.1093/mnras
OAI identifier: oai:iris.unife.it:11392/2049612
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