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.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"15 results found.
- KAIT Optical Upper Limits for GRB 120422A, 120724A, 120803B, 120911A, and 120923A
- Corrections to the Fermi-LAT upper limits for GRB 120807A, 120908A, 120909A, and 120911A
- GRB 120911A: optical upper limit CrAO
- GRB 120911A: optical upper limit ISON-NM
- GRB 120911A: Fermi GBM observation
- GRB120911A: MITSuME Okayama Optical upper limits
- GRB 120911A: Fermi/LAT upper limit
- GRB 120911A: Swift/UVOT Upper Limits
- GRB 120911A: Swift-XRT refined Analysis
- GRB 120911A: Swift-BAT refined analysis
- GRB 120911A: Enhanced Swift-XRT position
- GRB 120911A: Faulkes Telescope North observations
- GRB 120911A: Swift-XRT observations
- GRB 120911A: ROTSE-III Optical Limits
- GRB 120911A: Swift detection of a burst