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"21 results found.
- Konus-Wind detection of GRB 231118A
- GRB 231118A: REM optical afterglow detection
- GRB 231118A: ATCA detection of radio counterpart
- GRB 231118A: GRBAlpha detection
- GRB 231118A: VZLUSAT-2 detection
- GRB 231118A: Swift-BAT refined analysis
- 231118A: Swift-UVOT Detection
- GRB 231118A: Fermi GBM observation
- GRB 231118A: Swift-XRT refined Analysis
- GRB 231118A: MeerLICHT afterglow detection
- GRB 231118A: VLT/X-shooter redshift
- GRB 231118A: AstroSat CZTI detection
- GRB 231118A: Las Cumbres optical detection
- GRB 231118A: LCOGT Optical Observations
- GRB 231118A: MASTER OT observation
- GRB 231118A: Continued Skynet Observations
- GRB 231118A: Enhanced Swift-XRT position
- GRB 231118A: Swift-XRT position
- GRB 231118A: Skynet Optical Afterglow Discovery
- GRB 231118A: Swift detection of a burst
- GRB 231118A: Fermi GBM Final Real-time Localization