TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3278 SUBJECT: IBAS GRB Alert # 2463: not a GRB DATE: 05/04/16 22:56:22 GMT FROM: Sandro Mereghetti at IASF/CNR S. Mereghetti, D. Gotz (IASF, Milano) and N.Mowlavi (ISDC, Versoix) on behalf of the IBAS Localization Team report: Based on positional coincidence, soft spectral shape, and duration of the event, we conclude that the IBAS Alert n. 2463 which occurred on 2005-04-16 at 22:11:40 UT is most likely due to an outburst from the X-ray source AX J1754.2-2754 (Sakano et al. 2002, ApJS 138, 19) and not to a GRB