GRB 091018 Optical/NIR photometry (Wiersema+, 2012)

GRB 091018 triggered the Burst Alert Telescope (BAT) on board the Swift satellite at 20 48 19 ut on 2009 October 18 (trigger 373172; Stamatikos et al., 2009GCN.10034....1S). We acquired imaging polarimetry using the Focal Reducer and low dispersion Spectrograph (FORS2) mounted on Unit Telescope 1 (Antu) of the VLT, using the FORS2 Rspecial filter. (1 data file).