[vsnet-grb-info 2505] GRB 051211A: Swift/UVOT upper limits

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4342
SUBJECT: GRB 051211A: Swift/UVOT upper limits
DATE:    05/12/12 15:48:34 GMT
FROM:    Alexander Blustin at MSSL-UCL  <ajb at mssl.ucl.ac.uk>

A. J. Blustin (UCL-MSSL), G. Cusumano (INAF-IASF), J. Greiner (MPE),
D. Hinshaw (GSFC-SPSYS), N. Gehrels (GSFC) on behalf of the
Swift/UVOT team

The Swift/UVOT began observing the field of GRB 051211a at 15:50:04 UT
on 2005-12-11, 13 hours after the HETE trigger (Atteia et al., GCN 4324).
No potential optical/UV counterpart was found in co-added images in any
of the filters, within the reported 80 arcsec radius (90% confidence)
HETE error circle, down to the following 5-sigma magnitude upper limits 
(not corrected for extinction).

Filter   T_range(hours)  Exp(s)  5sigUL(mag)

V        14.9-15.1       886      19.4
B        13.5-13.7       738      20.2
U        13.3-16.7       1469     20.3
W1       13.0-16.5       1800     20.0
M2       11.9-15.3       1502     20.1
W2       14.6-14.9       900      20.1