There's a common misconception with that passage, thinking it is pertaining to a falling away and a revelation is necessary prior to our gathering. It's really a misreading. The passage states these things take place prior to the 'day of the Lord'. That is not the rapture and is easily understood as such just by doing a search of the passage as Paul would have known it.
For example, Amos 5:18 Woe unto you that desire the day of the LORD! to what end is it for you? the day of the LORD is darkness, and not light. Does this sound like our gathering to Him? No. Isn't that what we desire, and yet scripture declares a 'woe' on those who desire that day. Yes, if the day of the Lord was our gathering to Him, but it isn't. That's not a rapture statement.
The day of the Lord, the BEGINNING of the wrath of the Lord, is the same day as the gathering of the saints. The gathering happens right before it.
Just like Jesus describes, it's like the days of Noah and like the days of Lot. Just before God's wrath on the earth, He pulls the righteous out. But it is just before HIS wrath, not persecution caused by men, even the antichrist. What that says to me is that if you're not a christian, if you take the mark of the beast, so you're not being persecuted, life will be pretty normal. This is before the trumpets and vials obviously, but after the mark.
In 2 Thessalonians both chapters 1 and 2, Paul connected the wrath of God and the gathering of the saints/rapture to Him as happening in the same event. The beginning of His second coming.
What I get from Joel 2, Matthew 24/Mark 13/Luke 21, the Thessalonians epistles, and Revelation 6, is cosmological star signs that happen after the great tribulations that began at the abomination of desolation, followed by Jesus coming as the lightning across the sky, coming in the clouds, sitting on a throne, with the saints being gathered, and then the wrath of God starts.
Revelation 6:17 is the mark of when the day of the Lord begins, and if you'll notice the verses before it, they match up perfectly with Joel 2, the Olivet Discourse, and they also fit 1 Thessalonians 4:16-17 when you cross reference Matthew 24:30-31
1 Thessalonians 4:16-17 do not describe a secret event at all. It describes Jesus descending from heaven with a shout and the trump of God.
That's not secret at all.
The rapture IS the second coming but do not mistake that for Revelation 19. All events that happen after the sun and moon go dark in Revelation 6 are part of the second coming, and they take time, bare minimum 5 months and actually the 6th trumpet also says a year, a month, a day, and an hour, so 1.5 years before Armageddon Jesus comes in the clouds, or maybe even further back from Armageddon.
The timing of the Abomination of Desolation giving the last 3.5 years of Daniel's 70th week to the Antichrist, means at most 2 years of great tribulation, but it could be cut shorter than that. Matthew 24 says they will be cut short, so it won't be "7 year tribulation" or even "3.5 year tribulation". The time gets cut short of 3.5 years.