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.
- IceCube-210730A: not observable by Fermi-GBM
- GRB 210730A: Tautenburg observations
- IceCube-210730A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
- Fermi-LAT Gamma-ray Observations of IceCube-210730A
- GRB 210730A: Campo Imperatore optical observations
- GRB 210730A: BOOTES-5/JGT and 2.2m CAHA telescopes optical limit
- Swift GRB 210730A: Global MASTER-Net observations report
- GRB 210730A: TNG optical observations
- IceCube-210730A - IceCube observation of a high-energy neutrino candidate track-like event
- GRB 210730A: Fermi GBM observation
- GRB 210730A: AstroSat CZTI detection
- GRB 210730A: Swift-BAT refined analysis
- GRB 210730A: Swift-XRT refined Analysis
- GRB 210730A: Swift/UVOT Upper Limits
- GRB 210730A: Enhanced Swift-XRT position
- GRB 210730A: Swift detection of a burst near M82