I think this might be a Potanthus omaha. Please, verify, I am not 100% sure!!
http://peacockroyal.blogspot.ch/2012/08/lornie-trail-to-ranger-station.html
http://www.learnaboutbutterflies.com/India%20-%20Potanthus%20omaha.htm
http://www.ifoundbutterflies.org/1061-Potanthus/Potanthus-spp.
The Essex Skipper is a European butterfly and looks different:
http://en.wikipedia.org/wiki/Essex_Skipper
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