GCN Circular 6134
Subject
GRB070223: Swift/UVOT refined analysis
Date
2007-02-23T15:55:51Z (17 years ago)
From
Wayne Landsman at GSFC/SSAI <landsman@milkyway.gsfc.nasa.gov>
W. Landsman(NASA/GSFC), L. Angelini(GSFC/JHU) and J. Greiner(MPE) report
on behalf of the Swift UVOT team:
The Swift/UVOT observed the field of GRB 070223 starting 102s after the
BAT trigger (Vertere et al. 2007, GCN Circ. 6125) with the settling
exposure.
We do not find any source, in any of the UVOT observations, inside of
the refined XRT error circle (Vertere et al. 2007, GCN Circ. 6130).
We have the following 3-sigma upper limits for a source inside the XRT
error circle in the first exposure with the White filter, and in the
coadded frames with all filters:
Filter T_Start T_End Exp (s) 3sigma U.L. mag
White 120 219 98 20.2
V 102 295 79 18.9
B 5893 6084 189 20.6
U 5688 16398 351 20.5
UVW1 3863 16234 1069 21.2
UVM2 3658 3858 197 20.1
White 120 11872 1002 21.4
No correction has been made for the small extinction corresponding to
E(B-V) = 0.015
(Schlegel et al. 1998).