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"16 results found.
- GRB 100823A: optical upper limit
- GRB 100823A: optical observations
- GRB 100823A: MAXI/GSC detection
- GRB 100823A: Swift/UVOT Evidence for Fading Afterglow Emission
- GRB100823A : MOA optical observation
- GRB 100823A: Candidate IR afterglow
- GRB 100823A: Swift XRT refined analysis
- GRB 100823A: VLT/X-Shooter spectroscopy
- GRB 100823A - second epoch WHT observations
- GRB 100823A: TNG NIR observations
- GRB 100823: 1.5m OSN I-band observations
- GRB 100823A: Swift/UVOT Upper Limits
- GRB 100823A: WHT observations
- GRB 100823A: Swift-BAT refined analysis
- GRB 100823A: Enhanced Swift-XRT position
- GRB 100823A: Swift detection of a burst