The binary T Tauri system JW 566 in the Orion Molecular Cloud underwent an energetic , short-lived flare observed at submillimetre wavelengths by the SCUBA-2 instrument on 26 November 2016 ( UT ) .
The emission faded by nearly 50 % during the 31 minute integration .
The simultaneous source fluxes averaged over the observation are 500 \pm 107 \mathrm { \ > mJy\ > beam } ^ { -1 } at 450 \mu m and 466 \pm 47 \mathrm { \ > mJy\ > beam } ^ { -1 } at 850 \mu m. The 850 \mu \mathrm { m } flux corresponds to a radio luminosity of L _ { \nu } = 8 \times 10 ^ { 19 } \mathrm { \ > erg\ > s ^ { -1 } \ > Hz ^ { -1 } } , approximately one order of magnitude brighter ( in terms of \nu L _ { \nu } ) than that of a flare of the young star GMR-A , detected in Orion in 2003 at 3mm .
The event may be the most luminous known flare associated with a young stellar object and is also the first coronal flare discovered at sub-mm wavelengths .
The spectral index between 450 \mu m and 850 \mu m of \alpha = 0.11 is broadly consistent with non-thermal emission .
The brightness temperature was in excess of 6 \times 10 ^ { 4 } \mathrm { \ > K } .
We interpret this event to be a magnetic reconnection that energised charged particles to emit gyrosynchrotron/synchrotron radiation .