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We do not know for certain. Although "The Pilot Episode" had Susan state that she was from the 49th century, the final broadcast story "An Unearthly Child" contained no reference and no other indication has been given as to whether they exist in the past, future, or if such measures are inapplicable. And due to the Time Lords' ability to travel in time, the fact Gallifrey appeared in the skies over Earth circa 2009-2010 in "The End of Time" doesn't mean anything, either.

As of before "Deep Breath" and established in "Heaven Sent" Gallifrey has been moved to "The end of the Universe give or take a star system".