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"20 results found.
- GRB 100424A: Keck host detection and VLT/X-shooter redshift
- GRB 100424a. Radio observations
- GRB 100424A: CrAO optical observations
- GRB 100424A: NIR Afterglow Confirmation
- GRB 100424A: Gemini/NIRI H-band observations
- GRB 100424A: Swift/UVOT Upper Limits
- GRB 100424A: Liverpool Telescope Upper Limits
- GRB 100424A: Gemini/NIRI Candidate Afterglow
- GRB 100424A: D50 optical limits
- GRB100424A: MITSuME optical upper limits
- GRB 100424A : Lulin early z'-band upper limit
- GRB 100424A: GROND Upper Limits
- GRB 100424A: PAIRITEL NIR Upper Limits
- GRB 100424A: Swift-XRT refined analysis
- GRB 100424A: WHT z-band observations
- GRB 100424A: NOT optical observations
- GRB 100424A, Swift-BAT refined analysis
- GRB 100424A: Enhanced Swift-XRT position
- GRB 100424A: Prompt enhanced Swift-XRT position.
- GRB 100424A: Swift detection of a burst