Per instructions from Brant Reves in Credit dated 5/15/98 (a copy of which  has just been provided to me by Global Contracts), please inactivate the  Master Agreement [ERMS] with the referenced counterparty.
It appears Aurora  Natural Gas Systems LLC is a dba for Aurora Natural Gas, LLC.
We have an  ISDA Master Agreement dated 1/20/00 in place with Aurora Natural Gas, LLC and  all financial business should be transacted under such ISDA Master.
Further,  per Brant's instructions, all trades done with Aurora Natural Gas Systems,  LLC should be moved to the correct legal entity, Aurora Natural Gas, LLC.

Aurora Natural Gas Systems, LLC