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"15 results found.
- GRB 081203A: optical observations
- GRB081203A: Optical observations at Ishigaki
- GRB081203A: Radio upper limit at 15 GHz
- GRB081203A: MITSuME optical observation
- GRB 081203A: Optical observations of Xinglong TNT telescope
- GRB 081203A: Skynet/GORT Detections
- VLA Radio upper limit on GRB 081203A
- Konus-Wind observation of GRB 081203A
- GRB081203A: Swift-XRT refined analysis
- GRB 081203A: optical observations
- Swift UVOT observations of GRB 081203A
- GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
- GRB081203A: Swift/UVOT grism redshift
- GRB 081203A: Burst detection from Swift-BAT slew data
- GRB 081203A: Swift-BAT refined analysis