GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
8 results found.
- GRB 210218A: Swift-XRT confirmation of afterglow
- GRB 210218A: Swift/UVOT observations
- GRB 210218A: Swift-XRT observations
- GRB 210218A: Swift-BAT refined analysis
- GRB 210218A: MITSuME Akeno optical upper limits
- GRB 210218A： GWAC-F60A optical upper limit
- GRB 210218A: NEXT optical upper limit
- GRB 210218A: Swift detection of a burst