TITLE: GCN CIRCULAR NUMBER: 11428 SUBJECT: Swift detection of MAXIJ1409-619 DATE: 10/11/30 16:24:09 GMT FROM: Scott Barthelmy at NASA/GSFC V. Mangano (INAF-IASFPA), S. D. Barthelmy (GSFC), S. Campana (INAF-OAB), M. M. Chester (PSU), V. D'Elia (ASDC), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), J. M. Gelbord (PSU), C. Gronwall (PSU), S. T. Holland (CRESST/USRA/GSFC), N. P. M. Kuin (UCL-MSSL), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), B. Sbarufatti (INAF-OAB/IASFPA), R. L. C. Starling (U Leicester) and G. Stratta (ASDC) report on behalf of the Swift Team: At 15:35:29 UT, the Swift Burst Alert Telescope (BAT) triggered and located the previously-known source MAXI J1409-619 (trigger=439550). Swift slewed immediately to the source. The BAT on-board calculated location is RA, Dec 211.975, -61.988 which is RA(J2000) = 14h 07m 54s Dec(J2000) = -61d 59' 17" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows nothing obvious as is typical for a 10-min image trigger. No source was detected in the 2.5 sec promptly available XRT image. We are waiting for the full dataset to detect and localise the XRT counterpart. UVOT took a finding chart exposure of 87 seconds with the White filter starting 1108 seconds after the BAT trigger. UVOT detected no new source within the BAT error circle. The GCN Notice sequence was complicated because of a 20-sec gap in TDRSS coverage (a hand-off from one TDRSS to the next satellite), so the initial BAT_Position message was lost, which was then immediately followed by a 14-min telemetry downlink pass for which the TDRSS messages are held on-board until the end of the pass. Burst Advocate for this burst is V. Mangano (vanessa AT ifc.inaf.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)