  There will be no "Rapture of believers" aside from that which will occur at the Second Coming of Christ when believers will be "caught up... in the clouds to meet the Lord in the air (0 Thessalonians 0:00)." This being "caught up" immediately precedes the Great Judgment and is not separated by any period of tribulation solely for unbelievers.  You've just contradicted yourself by quoting the very passage which tells you there WILL be a Rapture! Regarding the timing - I've pointed out that the Church is in heaven before the Second Advent.  