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.
- IceCube-220907A: Classification of AT2022oyn as a Type Ia supernova
- IceCube-220907A: No significant detection in HAWC
- IceCube-220907A: Upper limits from a search for additional neutrino events in IceCube
- GRB 220907A: Swift-BAT refined analysis
- IceCube-220907A: One Candidate Counterpart from the Zwicky Transient Facility
- GRB 220907A: Fermi GBM observation
- GRB 220907A: Nanshan/NEXT optical upper limits
- GRB 220907A: Swift/UVOT Upper Limits
- GRB 220907A: Swift-XRT refined Analysis
- Fermi-LAT Gamma-ray Observations of IceCube-220907A
- GRB 220907A: Swift-XRT position
- GRB 220907A: Swift detection of a burst
- GRB 220907A: Fermi GBM Final Real-time Localization
- IceCube-220907A - IceCube observation of a high-energy neutrino candidate track-like event