GCN Circular 4814
Subject
GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
Date
2006-02-23T08:08:32Z (18 years ago)
From
Padi Boyd at GSFC <padi@milkyway.gsfc.nasa.gov>
F. Marshall (GSFC) P. Boyd (GSFC), M. Chester (PSU), J. Cummings (ORAU)
on behalf of the Swift/UVOT team report:
We have further analyzed the four individual finding chart sub-images
sent via TDRSS from the Swift UVOT containing the afterglow of
GRB 060223 (Cummings et al., GCN 4813).
The source is detected in the first 3 finding charts with an
upper limit in the fourth finding chart as follows:
Filter T_start(s) Exp(s) (mag/UL (detection significance))
V 86 200 18.0 +/- 0.14 (10 sigma)
B 293 200 21.0 0.5 (2.5 sigma)
V 835 200 19.6 0.4 (3.5 sigma)
B 1042 200 >21.3 (2 sigma)
Reported times are in seconds since the BAT trigger.
These magnitudes are uncorrected for the expected
Galactic extinction corresponding to E(B-V) = 0.12.
We note that the higher than expected B-V inferred from the first
three images could be caused by a redshift of z=3.3 or greater.