GRB 170903A: UAFO /ISON optical upper limit. Mazaeva, E. ; Chornaya, E. ; Pozanenko, A. ; Volnova, A. ; Matkin, A. ; Molotov, I. Abstract Publication: GRB Coordinates Network Pub Date: 2017 Bibcode: 2017GCN.21805....1M