As many as 13 states ruled by the BJP and parties that have supported it on various issues have submitted their borrowing options to the Centre to meet the GST revenue shortfall.These 13 states include Bihar, Odisha, Andhra Pradesh, Gujarat, Uttarakhand and Meghalaya.Six more states - Goa, Assam, Arunachal Pradesh, Nagaland, Mizoram and Himachal Pradesh - will be giving their option in a day or two, finance ministry sources said.Of the 13 states, 12 have preferred to opt for borrowing from the special window facilitated by the RBI. These states are AP, Bihar, Gujarat, Haryana, Karnataka, Madhya Pradesh, Meghalaya, Sikkim,Tripura, UP, Uttarakhand and Odisha.Only Manipur has so far opted for borrowing from the market.