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 100213B: Detection of Fading Optical Afterglow
- GRB 100213B: Mondy optical observations
- GRB
- GRB 100213B: GRT Optical Observation
- GRB 100213B: Enhanced Swift-XRT position
- GRB 100213B: Gemini-N Observations
- GRB 100213B: Swift/UVOT Upper Limits
- GRB 100213B: PAIRITEL NIR Upper Limits
- GRB 100213B: Swift-BAT refined analysis
- GRB 100213B: Swift XRT refined analysis
- GRB 100213A: Swift XRT refined analysis
- GRB 100213B: NOT optical observations
- GRB 100213B: Swift detection of a burst