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"18 results found.
- GRB 210702A: MeerKAT radio detection
- GRB 210702A: ALMA detection of mm-band rebrightening
- GRB 210702A: ATCA detection of radio rebrightening
- GRB 210702A: ATCA detection
- GRB 210702A: ALMA detection
- GRB 210702A, Swift-BAT refined analysis
- GRB 210702A: BOOTES-3/YA optical counterpart observations
- Konus-Wind detection of GRB 210702A
- GRB 210702A: Chilescope optical observations
- GRB 210702A: iTelescope optical afterglow observations
- GRB 210702A: AGILE detection
- GRB 210702A: CALET Gamma-Ray Burst Monitor detection
- GRB 210702A: Swift-XRT refined Analysis
- GRB 210702A: VLT/X-shooter redshift
- GRB 210702A: preliminary Swift/UVOT photometry
- GRB 210702A: Swift/UVOT redshift
- Swift GRB 210702A: Global MASTER-Net observations report
- GRB 210702A: Swift detection of a burst with a bright optical counterpart