TITLE: GCN CIRCULAR NUMBER: 20663 SUBJECT: IBAS Trigger 7691 is not a GRB DATE: 17/02/11 20:54:02 GMT FROM: Sandro Mereghetti at IASF-Milano/INAF S.Mereghetti (IASF-Milano), C.Ferrigno (ISDC, Versoix) on behalf of the IBAS Localization Team report: The IBAS trigger n. 7691 at 19:33:58 of February 11, 2017 is not due to a GRB. It was caused by the Crab due to incorrect attitude information.