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An unusual transient following the short GRB 071227
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Number of Authors: 102019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 489, no 1, p. 13-27Article in journal (Refereed) Published
Abstract [en]

We present X-ray and optical observations of the short duration gamma-ray burst GRB 071227 and its host at z= 0.381, obtained using Swift, Gemini South, and theVery Large Telescope. We identify a short-lived and moderately bright optical transient, with flux significantly in excess of that expected from a simple extrapolation of the X-ray spectrum at 0.2-0.3 d after burst. We fit the SED with afterglow models allowing for high extinction and thermal emission models that approximate a kilonova to assess the excess' origins. While some kilonova contribution is plausible, it is not favoured due to the low temperature and high luminosity required, implying superluminal expansion and a large ejectamass of similar to 0.1 M-circle dot. We find, instead, that the transient is broadly consistent with power-law spectra with additional dust extinction of E(B - V) similar to 0.4 mag, although a possibly thermal excess remains in the z band. We investigate the host, a spiral galaxy with an edge-on orientation, resolving its spectrum along its major axis to construct the galaxy rotation curve and analyse the star formation and chemical properties. The integrated host emission shows evidence for high extinction, consistent with the afterglow findings. The metallicity and extinction are consistent with previous studies of this host and indicate the galaxy is a typical, but dusty, late-type SGRB host.

Place, publisher, year, edition, pages
2019. Vol. 489, no 1, p. 13-27
Keywords [en]
gamma-ray burst: general, gamma-ray burst: individual: GRB 071227
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-175854DOI: 10.1093/mnras/stz2040ISI: 000489292800002OAI: oai:DiVA.org:su-175854DiVA, id: diva2:1369336
Available from: 2019-11-11 Created: 2019-11-11 Last updated: 2019-11-11Bibliographically approved

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Eyles, R. A. J.Rosswog, Stephan
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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CiteExportLink to record
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  • apa
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