[vsnet-grb-info 2987] GRB 060223a: Swift/UVOT refined analysis

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4824
SUBJECT: GRB 060223a: Swift/UVOT refined analysis
DATE:    06/02/24 02:02:39 GMT
FROM:    Alexander Blustin at MSSL-UCL  <ajb at mssl.ucl.ac.uk>

A. J. Blustin (UCL-MSSL), J. R. Cummings (NASA/ORAU) report on
behalf of the Swift/UVOT team:

The Swift/UVOT began observing the field of GRB 060223a 72 s
after the BAT trigger, detecting a red afterglow (Cummings
et al., GCN 4813; Marshall et al., GCN 4814). Analysis of a more
complete dataset shows that V was the only band to yield a
significant detection of the afterglow, as to be expected given
the redshift of the burst (z=4.41; Berger et al., GCN 4815).
The magnitudes and 3-sigma upper limits from all filters are
listed below.

Filter  T_range (MET)  Exp (s)  Mag/3sigUL

V       72-81          9        17.7 +/- 0.4
V       85-285         200      17.8 +/- 0.1
V       545-1034       239      19.4 +/- 0.3
V       1294-11097     512      >19.6

B       292-492        200      >20.2
B       641-7249       731      >20.9

U       616-7044       532      >20.4
UVW1    593-6839       355      >20.4
UVM2    569-6634       355      >20.9
UVW2    521-10892      580      >21.1

These are uncorrected for the estimated Galactic extinction
corresponding to E(B-V) = 0.12