[AAVSO-HEN] GRB 060111A: refined UVOT anaysis

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4497
SUBJECT: GRB 060111A: refined UVOT anaysis
DATE:    06/01/12 16:27:17 GMT
FROM:    Alexander Blustin at MSSL-UCL  <ajb at mssl.ucl.ac.uk>

S. R. Rosen (UCL-MSSL), S. Zane (UCL-MSSL), A. J. Blustin (UCL-MSSL),
K. Hurley (Berkeley), M. Chester (PSU), N. Gehrels (GSFC) on behalf
of the Swift/UVOT team

Further analysis of the Swift/UVOT data for GRB 060111A (Zane et al.,
GCN 4479) reveals that the afterglow candidate reported by Blustin et
al. (GCN 4482) in the initial UVOT V-band exposure has faded from view
in subsequent data. The 3 sigma magnitude upper limits from later summed
images in the different filters are as follows:

Filter   T_range(s)  Exp(s)  3sigUL(mag)

V        3750-4105   59      18.5
V        4757-10346  472     19.6

B        280-17141   1746    21.2
U        6042-16227  1476    20.8
W1       5838-21553  1033    20.3
M2       5633-10550  572     20.1
W2       9942-12104  435     20.1

These magnitudes are uncorrected for Galactic extinction.