Treasury began it's process of auctions for debt. Started on January 22th with the 26-week note and continue with the middle and long end into with the short-end of the curve. These are always taken and do not mean much relatively speaking.
It picks up on monday, the 28th with the 2 year note and is accelerated on into February with Notes and bonds.
Calling these auctions are a bit mis-leading as in order to participate in these on a large scale you must be a Primary Dealer.
"Primary dealers are trading counter-parties of the New York Fed in its implementation of monetary policy. They are also expected to make markets for the New York Fed on behalf of its official accountholders as needed, and to bid on a pro-rata basis in all Treasury auctions at reasonably competitive prices."
https://www.newyorkfed.org/markets/primarydealers
List of who is a Primary Dealer is cap 2
They are required to make these purchases in order to maintain the status of being one.
The relationship these dealers have with the FRB is sketchy at best. In the past when QE was born they had the ability to purchase these notes/bonds and then flip them back to the FRB for cash.
Look up Primary Dealer Repo-process.
The cash they receive for doing this is then able to find it's way any where they saw fit.
Space considerations limit moar.
If you remember Dylan Ratigan he went on an epic rant about a version of this that was done when the banks were starting to fail in 2007-08. Trash for cash. Many traders applauded that rant and never forgot it.