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 140320B: P60 detection of a very red afterglow
- GRB 130420B: CARMA and VLA radio observations
- GRB 130420B: Fermi GBM observation
- GRB 130420B: RATIR Optical and NIR Observations
- GRB 130420B: Swift-XRT refined Analysis
- GRB 130420B: Weihai optical upper limit
- GRB 130420B: Swift/UVOT Upper Limits
- GRB130420B: GMG optical upper limit
- GRB 130420B: Enhanced Swift-XRT position
- GRB 130420B, Swift-BAT refined analysis
- GRB 130420B: Faulkes Telescope North observations
- GRB 130420B: MASTER-Net optical observations
- GRB 130420B: Swift detection of a burst