Robuta

https://gcn.nasa.gov/circulars/9564 GCN - Circulars - 9564 - GRB 090621A: GRT Optical Observation gcn circulars grb grt optical https://test.gcn.nasa.gov/circulars/9564 GCN - Circulars - 9564 - GRB 090621A: GRT Optical Observation gcn circulars grb grt optical