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dc.contributor.authorFender, R.
dc.contributor.authorAnderson, Gemma
dc.contributor.authorOsten, R.
dc.contributor.authorStaley, T.
dc.contributor.authorRumsey, C.
dc.contributor.authorGrainge, K.
dc.contributor.authorSaunders, R.
dc.identifier.citationFender, R. and Anderson, G. and Osten, R. and Staley, T. and Rumsey, C. and Grainge, K. and Saunders, R. 2014. A prompt radio transient associated with a gamma-ray superflare from the young M dwarf binary DG CVn. Monthly Notices of the Royal Astronomical Society: Letters. 446 (1): pp. L66-L70.

On 2014 April 23, the Swift satellite detected a gamma-ray superflare from the nearby star system DG CVn. This system comprises an M-dwarf binary with extreme properties: it is very young and at least one of the components is a very rapid rotator. The gamma-ray superflare is one of only a handful detected by Swift in a decade. As part of our AMI-LA Rapid Response Mode, ALARRM, we automatically slewed to this target, were taking data at 15 GHz within 6 min of the burst, and detected a bright (~100 mJy) radio flare. This is the earliest detection of bright, prompt, radio emission from a high-energy transient ever made with a radio telescope, and is possibly the most luminous incoherent radio flare ever observed from a red dwarf star. An additional bright radio flare, peaking at around 90 mJy, occurred around one day later, and there may have been further events between 0.1-1 d when we had no radio coverage. The source subsequently returned to a quiescent level of 2-3 mJy on a time-scale of about 4 d. Although radio emission is known to be associated with active stars, this is the first detection of large radio flares associated with a gamma-ray superflare, and demonstrates both feasibility and scientific importance of rapid response modes on radio telescopes. © 2014 The Authors.

dc.publisherWiley-Blackwell Publishing Ltd.
dc.titleA prompt radio transient associated with a gamma-ray superflare from the young M dwarf binary DG CVn
dc.typeJournal Article
dcterms.source.titleMonthly Notices of the Royal Astronomical Society: Letters
curtin.departmentCurtin Institute of Radio Astronomy (Physics)
curtin.accessStatusFulltext not available

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