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"13 results found.
- GRB 220118A: TARGET optical upper limit
- GRB 220118A: 2.2m CAHA/CAFOS detections
- GRB 220118A: Fermi GBM detection
- GRB 220118A: COATLI Optical Observations
- GRB 220118A: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
- GRB 220118A: Swift-BAT refined analysis
- GRB 220118A: Swift/UVOT Detection
- GRB 220118A: GIT optical observations
- GRB 220118A: Enhanced Swift-XRT position
- GRB 220118A: MITSuME Akeno optical observation
- Swift GRB 220118A: Global MASTER-Net observations report
- GRB 220118A: Swift detection of a burst with an optical counterpart
- GRB 220118A: Fermi GBM Final Real-time Localization