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"12 results found.
- GRB 210824A: Swift/UVOT Upper Limits
- GRB 210824A: Swift-BAT refined analysis
- GRB 210824A: MITSuME Akeno optical upper limits
- Swift GRB 210824A: Global MASTER-Net observations report
- GRB 210824A: BOOTES-5/JGT optical upper limit
- GRB 210824A: Fermi GBM Observation
- Fermi GRB 210824A: Global MASTER-Net observations report
- GRB 210824A: Nanshan/NEXT optical upper limit
- GRB 210824A: Swift-XRT refined Analysis
- GRB 210824A: Enhanced Swift-XRT position
- GRB 210824A: Swift detection of a burst
- GRB 210824A: Fermi GBM Final Real-time Localization