[vsnet-grb-info 3828] GRB 060929, Swift-BAT further refined analysis - late-time flare

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  5662
SUBJECT: GRB 060929, Swift-BAT further refined analysis - late-time flare
DATE:    06/09/30 02:20:04 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <scott at lheamail.gsfc.nasa.gov>

D. Palmer (LANL), G. Sato (GSFC/ISAS), S. D. Barthelmy (GSFC),
T. Sakamoto (GSFC/ORAU), C. Markwardt (USFC/UMd), N. Gehrels (GSFC)
on behalf of the Swift-BAT team:
 
We have received additional data beyond that used for GCN Circ 5660
(Fenimore, et al) now out to T+1000 sec.  We note that there is
highly significant emmission in the mask-weighted light curve starting
at T+400 sec and ending at T+600 sec.  This emission is much softer
than the initial emission at T_zero.

Given the spectral signiture of the initial T_zero emission and
that there are no known sources at this location (Galactic or extra-Galactic),
we still strongly believe that this event is a GRB and not some other
non-GRB astrophysical source.  We therefore conclude that this late-time
emission is a flare.