Context
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I saw many times people using 落ちる in a chat followed by 後で. I assumed that the user expressed his intent of temporarily leaving a chat and planned to come back later.

Question
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* As the title mentions, is 落ちます an equivalent of "AFK1" with the underlying meaning of coming back later on?
* Is there a way to differentiate **"I got to go"** (*I don't plan to come back*) and **"I'll be back"** (*I temporarily leave the chat/game/whatever*)

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1**AFK**: **A**way **F**rom **K**eyboard