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"12 results found.
- GRB 090401B: Suzaku WAM observation of the prompt emission
- Konus-Wind observation of GRB 090401B
- GRB 090401B: Xinglong TNT optical Upper Limit
- GRB 090401B: VLA radio upper limit
- GRB 090401B: Upper limits of MITSuME optical observation
- GRB 090401B: NOT optical observations
- GRB 090401B: AGILE refined analysis
- GRB 090401B: Swift XRT Refined Analysis
- GRB 090401B: Enhanced Swift-XRT position
- AGILE Gamma-ray detection of GRB 090401B
- GRB 090401B: Swift-BAT refined analysis
- GRB 090401B: Swift detection of a burst