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On 2014 April 23, the Swift satellite detected a gamma-ray superflare fromthe nearby star system DG CVn. This system comprises a M-dwarf binary withextreme properties: it is very young and at least one of the components is avery rapid rotator. The gamma-ray superflare is one of only a handful detectedby Swift in a decade. As part of our AMI-LA Rapid Response Mode, ALARRM, weautomatically slewed to this target, were taking data at 15 GHz within sixminutes of the burst, and detected a bright (~100 mJy) radio flare. This is theearliest detection of bright, prompt, radio emission from a high energytransient ever made with a radio telescope, and is possibly the most luminousincoherent radio flare ever observed from a red dwarf star. An additionalbright radio flare, peaking at around 90 mJy, occurred around one day later,and there may have been further events between 0.1-1 days when we had no radiocoverage. The source subsequently returned to a quiescent level of 2-3 mJy on atimescale of about 4 days. Although radio emission is known to be associatedwith active stars, this is the first detection of large radio flares associatedwith a gamma ray superflare, and demonstrates both feasibility and scientificimportance of rapid response modes on radio telescopes.

A prompt radio transient associated with a gamma-ray superflare from the young M dwarf binary DG CVn