Indicates that something happens immediately after another action; "as soon as..." or "just after...". Often used in the pattern Verb (た) + 早々.
到着早々、彼は会議室に直行した。
As soon as he arrived, he went straight to the meeting room.
受賞の知らせを聞く早々、電話が鳴り始めた。
Just after hearing the news of the award, the phone started ringing.
発送早々、荷物の追跡番号をお送りしました。
We sent the tracking number immediately after shipping.
Quickly; in haste; promptly. Usually appears as 早々に (e.g. 早々に対応する = to deal with promptly).
ご連絡ありがとうございます。早々に確認してご報告します。
Thank you for contacting us. I will check promptly and report back.
問題が判明したため、早々に対策を講じた。
Since the problem was identified, we took measures promptly.
彼は朝早々に出発した。
He left early in the morning (in haste/early on).