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"12 results found.
- GRB 220611A: Host galaxy redshift from VLT/X-shooter
- GRB 220611A: X-ray afterglow Chandra sub-arcsecond localization
- GRB 220611A: Continued Gemini Infrared Observations
- GRB 220611A optical counterpart
- GRB 220611A: Gemini Ks counterpart detection
- GRB 220611A: Gemini South Infrared Detection
- GRB 220611A: Swift/UVOT Upper Limits
- GRB 220611A: Swift-BAT refined analysis
- Swift GRB 220611A: Global MASTER-Net observations report
- GRB 220611A: Swift-XRT refined Analysis
- GRB 220611A: Enhanced Swift-XRT position
- GRB 220611A: Swift detection of a burst