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"10 results found.
- GRB 201001A: Swift/UVOT Upper Limits
- GRB 201001A: TSHAO optical upper limit
- GRB 201001A: Xinglong-2.16m optical upper limit
- GRB 201001A: MITSuME Akeno optical upper limits
- GRB 201001A: Swift-BAT refined analysis
- GRB 201001A: Swift-XRT refined Analysis
- GRB 201001A: Fermi GBM observation
- GRB 201001A: Enhanced Swift-XRT position
- GRB 201001A: Swift detection of a burst
- GRB 201001A: Fermi GBM Final Real-time Localization