In krishan avtar of Dasam Granth Sahib, there comes Birha Natak.
There is an old Dasam Granth Sarup at Patna Sahib which is believed to be written by baba Deep Singh ji.
In this bir, at the starting of Birha Natak comes a baani called bhagwati ustat(also called bhagwati astotar). It's different from bhagauti astotar which comes at the starting of Judh parbandh section of krishan avtar of Dasam Granth Sahib.
It's also present in Dasam Granth Sarup of Bhai Daya Singh and Dasam Granth Sarup of Bhai Sukha Singh.
Giani Gurwinder Singh nangli has got this baani published in a beautiful Gutka Sahib and has also given information about this baani in his Gutka Sahib.
Gutka Sahib can be bought at
https://csjs.com/shop/panth-khalsa-nitnem-gutka-sahib-tarna-dal/