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We hereby report the discovery of ATLAS17jrp as an extraordinary TDE instar-forming galaxy SDSSJ162034.99+240726.5 in our recent sample ofmid-infrared outbursts in nearby galaxies. Its optical/UV light curves rise toa peak luminosity $\sim1.06\times10^{44}\rm\,erg\,s^{-1}$ in about a month andthen decay as $\rm t^{-5/3}$ with a roughly constant temperature around19000~K, and the optical spectra show a blue continuum and very broad Balmerlines with FWHM$\sim$15000 km/s which gradually narrowed to 1400 km/s within 4years, all agreeing well with other optical TDEs. A delayed and rapidly risingX-ray flare with a peak luminosity $\rm \sim 1.27\times10^{43}\,erg\,s^{-1}$was detected at $\rm \sim$ 170 days after the optical peak. The high MIRluminosity of ATLAS17jrp ($\sim2\times10^{43} \rm\,erg\,s^{-1}$) has revealed adistinctive dusty environment with covering factor as high as $\sim0.2$, thatis comparable with that of torus in active galactic nuclei but at least oneorder of magnitude higher than normal optical TDEs. Therefore, ATLAS17jrp turnsout to be one of the rare unambiguous TDE found in star-forming galaxies andits high dust covering factor implies that the dust extinction could play animportant role in the absence of optical TDEs in star-forming galaxies.

Discovery of ATLAS17jrp as an Optical, X-ray and Infrared Bright TDE in a Star-forming Galaxy