Robuta

https://gcn.nasa.gov/circulars/events/grb-200228b?query=200228B GCN - Circulars - Events - GRB 200228B gcn circulars events grb https://test.gcn.nasa.gov/circulars/27267 GCN - Circulars - 27267 - GRB 200228B: RATIR Optical Observations gcn circulars grb optical observations https://gcn.nasa.gov/circulars/27263 GCN - Circulars - 27263 - GRB 200228B: KAIT Optical Upper Limit gcn circulars grb kait optical https://gcn.nasa.gov/circulars/27273 GCN - Circulars - 27273 - GRB 200228B: Swift-BAT refined analysis gcn circulars grb swift bat https://gcn.nasa.gov/circulars/27272 GCN - Circulars - 27272 - GRB 200228B: RATIR Optical Observations gcn circulars grb optical observations https://gcn.nasa.gov/circulars/27268 GCN - Circulars - 27268 - GRB 200228B: Swift/UVOT Upper Limits gcn circulars grb swift upper