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').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"10 results found.
- GRB 220305A: Swift-BAT refined analysis
- Fermi GBM Sub-Threshold Detection of GRB 220305A
- GRB 220305A: Swift-XRT refined Analysis
- Fermi GRB 220305A: Global MASTER-Net observations report
- Correction to GCN 31689: Fermi GBM Report of GRB 220305A should be GRB 220305B
- GRB 220305A: Fermi GBM observation
- GRB 220305A: Enhanced Swift-XRT position
- Swift GRB 220305A: Global MASTER-Net observations report
- GRB 220305A: Swift-XRT observations
- GRB 220305A: Swift detection of a burst