Yes, the vision which Gabriel had appeared to him earlier in Daniel 8.
Which Daniels last words in Daniel 8 were -
27 And I Daniel fainted, and was sick certain days; afterward I rose up, and did the king's business; and I was astonished at the vision, but none understood it.
So Gabriel was sent to help Daniel understand the vision he had in Daniel 8 regarding the transgression of desolation by the little horn person in the time of the end.
So Gabriel lays out the 70 shmitahs, until that transgression by the little horn in the time of the end will take place (during the 70th shmitah) in Daniel 9:24-27.
The transgression of desolation is time of the end. The little horn person is the prince who shall come, who will ultimately commit that transgression of desolation after the becomes the Antichrist, the King of Israel/Messiah coming in his own name.
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mkgal1, I think you are under the impression what Gabriel said in Daniel 9:24-27 is itself a vision. It is not a vision, no more than if I were to read the verses to you - it would not be a vision you were having.
Gabriel is saying to Daniel what is going to take place and when. But Daniel himself was not having a vision by hearing it.