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.
- GRB 240805B: Osservatorio Astronomico Nastro Verde upper limit
- GRB 240805B: GIT optical upper limit
- GRB 240805B: Swift-BAT refined analysis
- GRB 240805B Bassano Bresciano Observatory upper limit
- GRB 240805B: JinShan optical afterglow detection
- GRB 240805B: AbAO, CrAO, and Terskol optical upper limits
- GRB 240805B: Optical detection with 1.6m Mephisto
- GRB 240805B: NUTTelA-TAO / BSTI Optical Limits
- GRB 240805B: Swift-XRT refined Analysis
- GRB 240805B: Swift/UVOT Upper Limits
- GRB 240805B: BTA optical afterglow candidate
- GRB 240805B: Enhanced Swift-XRT position
- GRB 240805B: LCOGT Optical Upper Limits
- Swift GRB 240805B: Global MASTER-Net observations report
- GRB 240805B: JinShan optical upper limits
- GRB 240805B: Swift detection of a burst