GRB060403: Search for an optical transient [Observed: 4 April 2006]
No optical counterpart for this gamma ray burst, down to mag 17.2, 14.9 hours after the event.

SwiftJ1753.5-0127 [Observed: 3, 5, 16, 17, 20 July, 4, 5 August 2005]
Time-series for this X and gamma-ray transient, which may be a black hole candidate, are presented.

GRB041211: Search for an optical transient [Observation: 11 Dec 2004]
10 hours after the burst, no optical counterpart down to mag 17.8.

GRB 030913 []
Analysis of images of GRB 030913, with a negative result.