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"17 results found.
- GRB 180620A: SEDM Observations
- GRB 180620A: AstroSat CZTI detection
- GRB 180620A iTelescope observation
- Konus-Wind observation of GRB 180620A
- GROND observations of GRB 180620A
- GRB 180620A: Swift-BAT refined analysis
- GRB 180620A: KAIT Optical Observations
- GRB 180620A: Xinglong-2.16m optical observations
- GRB 180620A: Swift-XRT refined Analysis
- GRB 180620A: COATLI Detection and Light Curve
- GRB 180620A: Swift/UVOT Detection
- GRB 180620A: LCO McDonald observations
- GRB 180620A: Enhanced Swift-XRT position
- GRB 180620A: MASTER OT observation
- GRB 180620A: ISON-MN afterglow confirmation
- GRB 180620A: RATIR Optical Afterglow Detection
- GRB 180620A: Swift detection of a burst with an optical counterpart