https://gcn.nasa.gov/circulars/events/grb-971227
GCN - Circulars - Events - GRB 971227
gcncircularseventsgrb
https://experts.arizona.edu/en/publications/lotis-search-for-early-time-optical-afterglows-grb-971227/
LOTIS search for early-time optical afterglows: GRB 971227 - University of Arizona
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