Robuta

https://gcn.nasa.gov/circulars/35388 GCN - Circulars - 35388 - GRB 231216A: Swift/UVOT Upper Limits gcn circulars grb swift upper https://gcn.nasa.gov/circulars/35394 GCN - Circulars - 35394 - GRB 231216A: Osservatorio Astronomico Nastro Verde upper limit osservatorio astronomico gcn circulars grb