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"13 results found.
- GRB 230216A Mondy Observations
- GRB 220306B: Swift/UVOT Upper Limits
- GRB 220306B: Nanshan/NEXT optical upper limit
- GRB 220306B: Mondy optical observations, confirmation afterglow candidate
- GRB 220306B: Tautenburg observations
- GRB 220306B: Swift-BAT refined analysis
- GRB 220306B: AbAO optical observations, possible afterglow candidate
- GRB 220306B: BOOTES-1 optical upper limit
- GRB 220306B: Swift-XRT refined Analysis
- GRB 220306B: Fermi GBM observation
- GRB 220306B: Enhanced Swift-XRT position
- Swift GRB 220306B: Global MASTER-Net observations report
- GRB 220306B: Swift detection of a burst