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 081222: MITSuME optical observation
- Konus-Wind observation of GRB 081222
- GRB 081222: Gemini-N confirmation of redshift z=2.77
- GRB 081222:Optical afterglow observation
- VLA radio upper limit on GRB 081222
- GRB 081222: Fermi GBM observation
- GRB 081222: Gemini-South absorption redshift
- GRB 081222, Swift-BAT refined analysis
- GRB 081222: Swift XRT refined analysis
- GRB 081222: Faulkes Telescope South observations
- GRB 081222: GROND Detection of the Optical/NIR Afterglow
- GRB081222: REM candidate afterglow
- GRB 081222: Swift detection of a burst with a bright optical afterglow