Robuta

https://test.gcn.nasa.gov/circulars/9731 GCN - Circulars - 9731 - GRB 090727: Swift/UVOT Upper Limits gcn circulars grb swift upper https://gcn.nasa.gov/circulars/9723 GCN - Circulars - 9723 - GRB 090727: Swift-XRT refined analysis gcn circulars grb swift xrt