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On J1 you are a nonresident alien for 2 years (nonstudent) or 5 years (student). As a nonresident alien you would need to file form 1040NR or 1040NR-EZ plus form 8843 for your federal return (plus a a state return, if applicable). Turbotax does not support these forms. However, they have to proper boxes to claim treaty exemptions.
You can download the forms from the IRS website. Sometimes, universities provide access to tax preparation software for their foreign students/postdocs etc.
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