Might I suggest, "Here it is" usually used in English to show that one has found something; for example a picture in an album, a search result on the web or just to show that you have found the answer to a question!
Now what about 'ot ' by itself? My Polish teacher once taught that 'Ot!' as an explitive at the beginning of any utterance is/was a Lembergism (Lwów), and hence pure dialect.
Further explanation, please?