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"12 results found.
- GRB 191031C: Insight-HXMT/HE detection
- GRB 191031C: Swift-BAT refined analysis
- GRB 191031C: Swift-XRT refined Analysis
- GRB 191031C: Swift/UVOT Detection
- GRB 191031C: Fermi GBM detection
- GRB 191031C: Enhanced Swift-XRT position
- Correction in name: GRB 191031D (not GRB 191031C)
- GRB 191031D: Swift detection of a short hard burst
- GRB 191031C: Fermi GBM Final Real-time Localization
- GRB 191031C: Prompt enhanced Swift-XRT position
- GRB 191031C: Swift detection of a burst
- GRB 191031C: Fermi GBM Final Real-time Localization