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"11 results found.
- IceCube-181023A: HAWC follow-up
- IceCube-181023A: MASTER Net optical alert and follow up observations
- Search for counterparts to IceCube-181023A with IceCube
- Fermi-LAT Gamma-ray Observations of IceCube-181023A
- GRB 181023A: Swift-BAT refined analysis
- GRB 181023A: Swift/UVOT Upper Limits
- IceCube-181023A - IceCube observation of a high-energy neutrino candidate event
- GRB 181023A: Swift-XRT refined Analysis
- GRB 181023A: Enhanced Swift-XRT position
- GRB 181023A: KAIT Optical Upper Limit
- GRB 181023A: Swift detection of a burst