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"16 results found.
- GRB 250330A Swift-BAT refined analysis
- IceCube-250330A: MASTER detection of PKS 2032+107 blazar flare with Zhirkov effect
- IceCube-250330A: Upper limits from a search for additional neutrino events in IceCube
- GRB 250330A: VLT/FORS2 Afterglow Detection
- Fermi-LAT gamma-ray observations of IceCube-250330A
- GRB 250330A: Fermi GBM Observation
- GRB 250330A: SVOM/VT optical upper limit
- Fermi GRB 250330A: Global MASTER-Net observations report
- GRB 250330A: BOOTES-7 early optical upper limit
- GRB 250330A: Swift/UVOT Upper Limits
- GRB 250330A: Swift-XRT afterglow detection
- GRB 250330A: Fermi GBM Final Localization
- IceCube-250330A - IceCube observation of a high-energy neutrino candidate track-like event
- GRB 250330A: VLT/FORS2 Optical Observations
- GRB 250330A: Prompt Swift-XRT position
- GRB 250330A: Swift detection of a burst