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 251103B: Swift-BAT refined analysis
- GRB 251103B: AstroSat CZTI detection
- GRB 251103B: Swift/UVOT Upper Limits
- GRB 251103B: Fermi GBM observation
- GRB 251103B: Nanshan/HMT optical upper limit
- GRB 251103B: MITSuME Akeno optical upper limits
- GRB 251103B: Swift-XRT refined Analysis
- Swift GRB 251103B: Global MASTER-Net observations report
- GRB 251103B: GROWTH-India Telescope optical upper limits
- GRB 251103B: Enhanced Swift-XRT position
- GRB 251103B: Prompt enhanced Swift-XRT position
- GRB 251103B: Swift detection of a burst
- GRB 251103B: Fermi GBM Final Real-time Localization