[vsnet-grb-info 1716] Swift trigger 143708 is really GRB 050701
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Fri Jul 1 21:40:09 JST 2005
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 3556
SUBJECT: Swift trigger 143708 is really GRB 050701
DATE: 05/07/01 12:38:19 GMT
FROM: Hans Krimm at NASA-GSFC <krimm at milkyway.gsfc.nasa.gov>
P. Boyd (GSFC/UMBC), L. Barbier (NASA GSFC),
D. Burrows (PSU), N. Gehrels (NASA GSFC), M. Goad (Leicester),
C. Hurkett (Leicester), M. Ivanushkina (PSU), H. Krimm (GSFC/USRA),
C. Markwardt (GSFC/UMD), K. Page (Leicester U), D. Palmer (LANL),
A. Parsons (NASA GSFC), T. Poole (MSSL), P. Roming (PSU)
At 11:42:59 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB050701(trigger=143708). The BAT on-board
calculated location is RA,Dec 227.287d -59.419d
{+15h 09m 09s, -59d 25' 06"} (J2000) with an uncertainty of 3 arcmin
(radius, 3-sigma, including estimated systematic uncertainty). The
detection significance in the image plane is 14.2 sigma.
The BAT light curve showed a complex multipeaked structure
with a duration of about 40 seconds. The peak
count rate of 5000 counts/sec (15-350 keV) was measured by
BAT in the 1-sec time interval centered on T+15 sec after the trigger.
Because this burst was 40 arcminutes from a known source
(PSR 1509-58) it was incorrectly classified on-board
and so Swift did not automatically slew to observe this burst.
A target of opportunity observation is being planned.
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