[vsnet-grb-info 2138] GRB 050915: Swift detection of a GRB
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Thu Sep 15 21:09:52 JST 2005
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 3977
SUBJECT: GRB 050915: Swift detection of a GRB
DATE: 05/09/15 12:07:39 GMT
FROM: David Palmer at LANL <dmpalmer at mac.com>
D. Grupe (PSU), A. Beardmore (U. Leicester), D. Burrows (PSU),
J. Cummings (GSFC/NRC), K. Page (U. Leicester), D. Palmer (LANL),
P. Roming (PSU), E. Rol (U. Leicester) N. Gehrels (GSFC)
on behalf of the Swift Team
At 11:22:42 UT, Swift-BAT triggered and located GRB050915
(trigger=155242). The BAT on-board calculated location is
RA,Dec 81.714d, -28.030d {05h 26m 51s, -28d 01' 48"} (J2000),
with an uncertainty of 3 arcmin (radius, 90% containment, stat+sys).
The BAT light curve showed a multi-peak structure with at least
4 well-separated peaks and a total duration of 25 sec. The peak
count rate was ~1500 counts/sec (15-350 keV), at ~14 seconds after
the trigger.
The spacecraft slewed immediately and the XRT began
observing the BAT position at 11:24:09 UT (T+87 s). The
count rate was too low for an on-board centroid, but the
spectrum and lightcurve strongly suggest that XRT observed a
rapidly-fading X-ray source in the field. The XRT position
will be available following the next ground station data
dump.
UVOT finds no obvious new sources in the BAT error circle in
a 100 sec image starting at T+85 s. Further analysis will
follow.
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