An unusual transient following the short GRB 071227

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Fältnamn	Indikatorer	Metadata
000		03187naa a2200433 4500
001		oai:DiVA.org:su-175854
003		SwePub
008		191111s2019 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1758542 URI
024	7	a https://doi.org/10.1093/mnras/stz20402 DOI
040		a (SwePub)su
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Eyles, R. A. J.4 aut
245	1 0	a An unusual transient following the short GRB 071227
264		c 2019-07-25
264	1	b Oxford University Press (OUP),c 2019
338		a print2 rdacarrier
520		a 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.
650	7	a NATURVETENSKAPx Fysik0 (SwePub)1032 hsv//swe
650	7	a NATURAL SCIENCESx Physical Sciences0 (SwePub)1032 hsv//eng
653		a gamma-ray burst: general
653		a gamma-ray burst: individual: GRB 071227
700	1	a O'Brien, P. T.4 aut
700	1	a Wiersema, K.4 aut
700	1	a Starling, R. L. C.4 aut
700	1	a Gompertz, B. P.4 aut
700	1	a Lamb, G. P.4 aut
700	1	a Lyman, J. D.4 aut
700	1	a Levan, A. J.4 aut
700	1	a Rosswog, Stephanu Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)4 aut0 (Swepub:su)stero
700	1	a Tanvir, N. R.4 aut
710	2	a Stockholms universitetb Institutionen för astronomi4 org
773	0	t Monthly notices of the Royal Astronomical Societyd : Oxford University Press (OUP)g 489:1, s. 13-27q 489:1<13-27x 0035-8711x 1365-2966
856	4	u https://academic.oup.com/mnras/article-pdf/489/1/13/29195153/stz2040.pdf
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-175854
856	4 8	u https://doi.org/10.1093/mnras/stz2040

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Av författaren/redakt...: Eyles, R. A. J.; O'Brien, P. T.; Wiersema, K.; Starling, R. L. ...; Gompertz, B. P.; Lamb, G. P.; visa fler...; Lyman, J. D.; Levan, A. J.; Rosswog, Stephan; Tanvir, N. R.; visa färre...

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