Sri Pamchanan was the chief disciple of Sri LAhIrI mahAshaya.
Very well known for his geeta commentary.
I would like to know about all books penned by him and if any of these available online as pdf version
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It seems you can order books by him and on him from this website:
(Shipping to India though...)
These books are available online : https://www.amazon.in/Books-Panchanan-Bhattacharya/s?ie=UTF8&page=1&rh=n%3A976389031%2Cp_27%3APanchanan%20Bhattacharya
I could not get the list of all His books.I shall search for His bengali books and update.But probably these if any are not yet been translated.