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GCN Circular 4233

Subject
GRB051109B: no UVOT source detected
Date
2005-11-09T18:44:19Z (18 years ago)
From
Massimiliano de Pasquale at MSSL-UCL <mdp@mssl.ucl.ac.uk>
M. De Pasquale (UCL-MSSL), G. Tagliaferri (INAF-Brera), A.J. Blustin 
(UCL-MSSL), D. Hinshaw (GSFC-SPSYS), M. Carter (UCL-MSSL),
N. Gehrels (GSFC) on the behalf the UVOT/Swift Team:

  The Swift UVOT began observing the field of GRB051109B at 08:41:03 UT,
84 seconds after the BAT Trigger (Tagliaferri et al, GCN 4222). No new
source with respect to USNO B1.0 is detected within the 4 arcsecond
radius XRT error circle (Campana et al., GCN 4226), either in the first
exposure or in the coadded V-band exposures down to the following 3
sigma magnitude upper limits:

  Filter   T_range (sec)   Exp (sec)   3sigUL
    V         84-284         200       18.9
    V         84-8280        4956      20.8

  The source previously reported in GCN 4222 was actually an artefact
of the onboard processing and was not a real source.

  These values are not corrected for Galactic extinction.
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