TITLE:   GCN CIRCULAR
NUMBER:  3288
SUBJECT: Swift-BAT detection of the bright and long GRB 050418
DATE:    05/04/18 11:49:31 GMT
FROM:    Takanori Sakamoto at NASA/GSFC  <takanori@milkyway.gsfc.nasa.gov>

L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/NRC), 
E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (GSFC/UMD), 
K. Hurley (UC Berkeley), H. Krimm (GSFC/USRA), 
C. Markwardt (GSFC/UMD), F. Marshall (GSFC),  D. Palmer (LANL), 
A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS), 
M. Suzuki (Saitama), J. Tueller (GSFC) 
on behalf of the Swift-BAT team: 

At 11:00:34.6 UT Swift-BAT triggered on burst GRB 050418 
(trigger=114893).  The BAT flight position is RA,Dec=44.341,-18.538 
(J2000).  We note this is 34 deg from the Sun, hence the s/c did not 
slew because of the Sun observing constraint.  The burst was 39 deg 
off the BAT boresight.  The lightcurve shows a main peak of duration 
15-20 seconds, followed by apparent peaks at up to 70-80 seconds after 
the trigger.  The peak count rate measured by BAT was 4500 counts/sec 
in the 15-350 keV band.