TITLE: GCN CIRCULAR NUMBER: 18031 SUBJECT: Swift trigger 649143 is not AX J1619.4-4945 or other astrophysical source DATE: 15/07/17 13:26:37 GMT FROM: Amy Lien at GSFC A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), J. A. Kennea (PSU) P. Romano (INAF-IASFPA) report on behalf of the Swift Team: We conclude that Swift trigger 649143 (Barthelmy, et al., GCN Circ. 18025) was the result of noise fluctuations and is not due to AX J1619.4-4945 or other astrophysical event. We have analyzed the BAT data set from T-119 to T+148 sec from the recent telemetry downlink. We find that there is no sign of significant emission from the trigger location at any point in this interval. XRT observations with 471 seconds of data show a detection of AX J1619.4-4945 at 0.05 c/s, which is consistent with the quiescent flux level of this source.