GCN Circular 3315
Subject
GRB 050422: Swift XRT Position
Date
2005-04-22T11:05:11Z (19 years ago)
From
David Burrows at PSU/Swift <dxb15@psu.edu>
C. Pagani (INAF-OAB), D. N. Burrows (PSU), A. P. Beardmore (U. Leicester),
and N. Gehrels (GSFC) report on behalf of the Swift XRT team:
The Swift BAT instrument detected a GRB at 07:52:40 UT on 22nd April 2005
(GCN Circ 3314). The spacecraft executed a prompt slew and the XRT began
taking data on the target at 07:54:29.4 UT. Due to the presence of a
cosmic ray in the initial image the on-board software could not properly
centroid on the GRB, and the position generated on-board and sent out
automatically through BACODINE was incorrect (the Notice indicated that
this position was probably a cosmic ray). From ground processed data we
find a uncataloged, rapidly X-ray source within the BAT error circle,
located at:
RA(J2000) = 21:37:54.5,
Dec(J2000) = +55:46:46.6.
We estimate an uncertainty of about 5 arcseconds radius (90%
containment). This position is 84 arcseconds from the BAT position
reported in GCN 3314.