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"11 results found.
- GRB 180402A: ISON-NM early optical limits
- GRB 180402A: Fermi GBM refined spectral analysis
- Konus-Wind observation of GRB 180402A
- GRB 180402A: Swift/UVOT Upper Limits
- GRB 180402A: Swift-XRT refined Analysis
- GRB 180402A: Fermi GBM detection
- GRB 180402A, Swift-BAT refined analysis
- GRB 180402A: KAIT Optical Upper Limit
- GRB 180402A: RATIR Upper Limits
- GRB 180402A: LCO McDonald observations
- GRB 180402A: Swift detection of a possibly short burst