TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2727 SUBJECT: XRF040916, optical observations DATE: 04/09/19 01:48:04 GMT FROM: Arne A. Henden at USNO/USRA A. Henden (USRA/USNO) reports on behalf of the USNO GRB team: We have an Ic mosaic of the field for XRF040916 (Yamazaki et al. GCN 2712) taken with the NOFS 1.0m telescope about an hour earlier than the data reported by Kosugi et al. (GCN 2726). Their proposed candidate appears on that mosaic at position 23:00:55.13 -05:38:43.2 J2000 (errors 0.2arcsec) and with magnitude Ic = 20.51 +/- 0.23 based on the calibration photometry of Henden (GCN 2719). This would imply a very red object or rapid fading.