GCN Circular 11428

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.)