https://test.gcn.nasa.gov/circulars/6836
GCN - Circulars - 6836 - GRB 070714B: host galaxy spectroscopic redshift
gcn circularshost galaxyspectroscopic redshiftgrb
https://gcn.nasa.gov/circulars/10053?query=091029
GCN - Circulars - 10053 - GRB 091020: NOT spectroscopic redshift
gcn circularsspectroscopic redshiftgrb
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https://rubinobservatory.org/for-educators/glossary/spectroscopic-redshift
spectroscopic redshift | Rubin Observatory
spectroscopic redshiftrubin observatory