TITLE: GCN CIRCULAR NUMBER: 5876 SUBJECT: INT+WFC observations of GRB 061126 DATE: 06/11/28 15:32:42 GMT FROM: Evert Rol at U.Leicester E. Rol (U of Leicester), K. Wiersema (U of Amsterdam) and P. Prema (Cambridge) report on behalf of a larger collaboration: We observed the afterglow of GRB 061126 (Sbarufatti et al, GCN Circ. 5854) on the nights of 26-27 and 27-28 November, with the Wide Field Camera (WFC) on the 2.5m Isaac Newton Telescope at La Palma. We detect the afterglow in r' and i' images on both nights. Photometry relative to the SDSS data (Cool et al, GCN Circ. 5863) shows a steadily declining light curve with a -1.0 (+/- 0.1) power-law decay between 0.54 and 1.76 days after the burst, with no evidence for a break. This is in contrast to the report by Kann (GCN Circ. 5875). The r'-band image at 1.76 days post burst shows the likely host galaxy underneath the afterglow. The magnitude of the host + OT in a seeing-matched aperture is 22.76 +/- 0.06. The image can be seen at http://www.star.le.ac.uk/~er45/grb061126/ . The underlying host probably means the light curve decay is somewhat steeper than our estimated -1.0 decay, although not by too much, and would likely not explain the discrepancy with the result reported by Kann. The large field of view of the WFC, in combination with the SDSS astrometry, allows for an accurate astrometric solution of the optical afterglow position. Our best position is (J2000): RA = 05 46 24.428 Dec = 64 12 38.78 with an estimated error of 0.12 arcseconds in both coordinates.