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.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"16 results found.
- IceCube-240419A: Upper limits from a search for additional neutrino events in IceCube
- GRB 240419A: Swift-BAT refined analysis
- GRB 240419A: Possible ATCA radio detection
- Fermi-LAT gamma-ray observations of IceCube-240419A
- GRB240419A: Skynet Optical Afterglow Analysis
- IceCube-240419A - IceCube observation of a high-energy neutrino candidate track-like event
- IceCube-240419A - IceCube observation of a high-energy neutrino candidate track-like event
- GRB 240419A: Swift/UVOT Upper Limits
- Swift GRB 240419A: Global MASTER-Net observations report
- GRB 240419A: REM NIR afterglow detection
- GRB 240419A: Swift-XRT refined Analysis
- GRB 240419A: VLT/UVES redshift of z = 5.178
- GRB 240419A: VLT optical afterglow detection
- GRB 240419A: Enhanced Swift-XRT position
- GRB 240419A: Prompt enhanced Swift-XRT position
- GRB 240419A: Swift detection of a burst