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GCN Circular 3353

Subject

Swift UVOT observation of GRB 050504

Date

2005-05-04T18:50:47Z (19 years ago)

From

Massimiliano de Pasquale at MSSL-UCL <mdp@mssl.ucl.ac.uk>

M. De Pasquale (MSSL), A. Blustin (MSSL), A. Morgan (PSU),
T. Poole (MSSL), M. Still (GSFC), N. Gehrels (GSFC), K.
Mason (MSSL), J. Nousek (PSU), on behalf of the Swift UVOT
team

  The Swift UVOT began observing the field of GRB 050504
(Mereghetti et al, GCN 3348Not found
 
 
) 5.45 hours after the trigger.
We have co-added all UVOT V-band exposures of GRB 050504
taken between 13:27 UT and 13:45 UT, for a total exposure
time of 989 seconds.

  No new source is detected within a 2 arcmin radius error
circle around the position given by Mereghetti et al. We
obtain a three sigma upper limit from the summed image of
V=20.2.

  The magnitudes are based on preliminary zero-points, measured
in orbit, and will require refinement with further calibration.