TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2802 SUBJECT: GRB041006: Optical observations and Potential host galaxy DATE: 04/10/14 10:17:18 GMT FROM: Johan U. Fynbo at U.Copenhagen J. P. U. Fynbo, B. L. Jensen, K. Pedersen, D. Watson, P. Jakobsson, G. Bjornsson, J. M. Castro Cerón, H. Pedersen, J. Hjorth (U. Copenhagen), D. Zucker (MPIA) and T. Pursimo (NOT) report: "We have observed the field of GRB 041006 (Galassi et al., GCN #2770) at two epochs with the 2.56m Nordic Optical Telescope using the MOSCA instrument (R-band). At the position of the afterglow (Costa et al., GCN #2735), we detect the following: Date (UT 2004) | t_b+ | exptime | Seeing | mag. ------------------------------------------------------------ Oct. 06.96 10.8h 300s+3x600s ~0.8" R~20.5 Oct. 11.18 112.2h 5x600s ~1.9" R~23.6 The photometry is relative to the magnitude of a nearby star as measured by Henden (GCN #2801). The source is clearly extended in the 2nd epoch image (although the seeing was poor), so the potential host galaxy is most likely contributing most of the flux. A section of the 2nd epoch image can be seen at http://www.astro.ku.dk/~brian_j/grb/grb041006 ."