GRB060904b optical detections (delayed report due to internet outage). Prymak, N. ; Kanbach, G. ; Steinle, H. ; Stefanescu, A. ; Duscha, S. ; Schrey, F. ; Muehlegger, M. Abstract Publication: GRB Coordinates Network Pub Date: 2006 Bibcode: 2006GCN..5541....1P