Not Amata.
Ceryx is unlikely too, as this genus contains very small species (for Syntomini).
May I suggest you search for the genus Caeneressa ?
Please can you add this observation to the http://www.inaturalist.org/projects/moths-of-thailand project?
(you can sign in with your Facebook account, and add via http://www.inaturalist.org/observations/new?project_id=10474)
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