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"14 results found.
- GRB 220117A, GROND observations
- GRB 220117A: Terskol and AbAO optical upper limits
- GRB 220117A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
- GRB 220117A: MITSuME Akeno optical upper limits
- Fermi GBM Sub-Threshold Detection of GRB 220117A
- GRB 220117A: Swift-BAT refined analysis
- GRB 220117A: Swift/UVOT Upper Limits
- GRB 220117A: LCO Optical Observations
- GRB 220117A: VLT/X-shooter optical afterglow and redshift
- GRB 220117A: Swift-XRT refined Analysis
- GRB 220117A: Enhanced Swift-XRT position
- Swift GRB 220117A: Global MASTER-Net observations report
- GRB 220117A: Nanshan/NEXT optical observations and a nearby PanSTARRS source
- GRB 220117A: Swift detection of a burst