GRB 070920A: deep optical observations at the NOT. Jaunsen, A. O. ; Gorosabel, J. ; Fynbo, J. P. U. ; Malesani, D. ; Sollerman, J. ; Gall, C. ; Morel, T. ; Stritzinger, M. D. ; Somero, A. ; Telting, J. ; Villforth, C. Abstract Publication: GRB Coordinates Network Pub Date: 2007 Bibcode: 2007GCN..6921....1J