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"16 results found.
- GRB 221216A: Swift-BAT refined analysis
- IceCube-221216A: No Candidate Counterparts from the Zwicky Transient Facility
- GRB 221216A: Detection by VZLUSAT-2
- Fermi-LAT gamma-ray observations of IceCube-221216A
- IceCube-221216A: Upper limits from a search for additional neutrino events in IceCube
- GRB 221216A: Swift/UVOT Upper Limits
- GRB 221216A: Fermi GBM observation
- GRB 221216A: Swift-XRT refined Analysis
- GRB 221216A: AKO Upper Limit
- GRB 221216A: Enhanced Swift-XRT position
- Swift GRB 221216A: Global MASTER-Net observations report
- GRB 221216A: Zadko observatory - Gingin optical observations
- GRB 221216A: Nanshan/NEXT optical upper limits
- GRB 221216A: Swift detection of a burst
- GRB 221216A: Fermi GBM Final Real-time Localization
- IceCube-221216A - IceCube observation of a high-energy neutrino candidate track-like event