Robuta

https://gcn.nasa.gov/circulars/279 GCN - Circulars - 279 - GRB990316, Optical observations gcn circulars optical observations https://gcn.nasa.gov/circulars/277?page=439&limit=100&query=081211B+%3F&view=index GCN - Circulars - 277 - GRB990316: simultaneous optical observation gcn circulars simultaneous optical observation