[vsnet-grb-info 15519] GRB 140909A: Swift detection of a GRB

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16808
SUBJECT: GRB 140909A: Swift detection of a GRB 
DATE:    14/09/09 17:59:24 GMT
FROM:    David Palmer at LANL  <palmer at lanl.gov>

David Palmer reports on behalf of the Swift Team:

In two successive 64-second images, beginning at 06:56:51, BAT detected a source at a consistent
location.  Although the individual images were below threshold, the combined detection
is highly significant, in excess of 8 sigma.  A 320 s image that includes the data
from both 64 s images indicates additional flux outside of the 128 s time interval.

The BAT on-board calculated location is RA,dec = 193.638,63.494 (J2000), which is
  RA(J2000) =  12h 54m 33s
  Dec(J2000) = +63d 29’ 38”

As is usual for image triggers, there is no obvious variation in the BAT lightcurve.

Because the individual images were below threshold, Swift did not automatically
slew to the location.  However, a ToO has been requested.

-- 
David Palmer  palmer at lanl.gov   (505)665-6863 (voice)   (505)665-4414 (fax)