[vsnet-grb-info 1838] GRB 050724: SWIFT XRT refined position

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3678
SUBJECT: GRB 050724: SWIFT XRT refined position
DATE:    05/07/25 23:46:41 GMT
FROM:    Angelo Antonelli at Obs. Astro. di Roma  <a.antonelli at mporzio.astro.it>

L.A. Antonelli (INAF/OAR), P. Romano, A. Moretti, S. Covino (INAF/OAB), 
D. Burrows (PSU) on behalf of the SWIFT XRT Team report:

We have analyzed the first 20 ksec of the Swift XRT observation of GRB 
050724 (GCN 3665, Covino et al.). We derived a refined position of the 
X-ray afterglow
by performing a boresight correction based on the USNO catalog. The new 
coordinates of the X-ray afterglow are:  RA(J2000) =  16h 24m 44.8s, 
Dec (J2000) = -27d 32' 31.8" with an uncertainty of 5.4 arcseconds 
radius (3 sigma). This position is 69 arcseconds from the refined BAT 
position given in GCN 3667 (H. Krimm et al),  2.6 arcseconds from the 
XRT position given in GCN 3665 and 7.1 arcseconds from the XRT position 
given in GCN 3669 (Romano et al.).

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