Some some second tier central bank seems to be maxing out a loan facility from the US Federal Reserve. There is another more preferential facility for acquiring dollars that is limited to the Bank of Canada, the Bank of England, the European Central Bank, the Bank of Japan, and the Swiss National Bank, so presumably this borrower is not one of them. The central banks that were provided dollars by the FED in 2008 included the Reserve Bank of Australia, the Banco Central do Brasil, the Bank of Canada, Danmarks Nationalbank, the Bank of England, the European Central Bank, the Bank of Japan, the Bank of Korea, the Banco de Mexico, the Reserve Bank of New Zealand, Norges Bank, the Monetary Authority of Singapore, Sveriges Riksbank, and the Swiss National Bank, so my guess would be that those would be the central banks allowed to borrow from the FED on relative short notice without significant, observable, administrative action. So my first cut guess would be that either Australia, Brazil, Denmark, South Korea, Singapore or Sweden is having trouble readily acquiring dollars through normal market channels.
A little noticed and thus little commented upon aspect of the Great Financial Crisis was that the US Federal Reserve loaned around $600,000,000,000 to other central banks to keep the global economy lubricated as people rushed to buy (and presumably temporarily hoard) dollars as a safe haven asset. The amount just borrowed looks to have been $60,000,000,000 or 10% of the global total from 2008.