GCN Circular 8725
Subject
GRB 081224: Swift-XRT observation
Date
2008-12-25T10:17:22Z (15 years ago)
From
Kim Page at U.of Leicester <kpa@star.le.ac.uk>
K.L. Page and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT
team:
Swift performed a Target of Opportunity follow-up observation of the Fermi
GBM and LAT burst GRB 081224 (Wilson-Hodge et al., GCN Circ. 8723),
starting 18 ks after the trigger.
There is a faint X-ray source (~6.7x10^-3 count s^-1) within the XRT field
of view, detected in the 3.6 ks of data collected so far. Using 1193 s of
XRT Photon Counting mode data and 1 UVOT image, we find an astrometrically
corrected X-ray position (using the XRT-UVOT alignment and matching UVOT
field sources to the USNO-B1 catalogue): RA, Dec = 213.1494, 74.1999,
which is equivalent to:
RA (J2000): 14 12 35.85
Dec (J2000): +74 11 59.5
with an uncertainty of 3.4 arcsec (radius, 90% confidence).
However, we note that the uncertainty on the LAT position (36 arcmin) is
larger than the XRT field of view, so Swift has not observed the complete
error circle. We also cannot say whether the XRT source is fading at this
time.
This circular is an official product of the Swift-XRT team.