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"14 results found.
- GRB 171120A CALET Gamma-Ray Burst Monitor detection
- GRB 171120A: Insight-HXMT detection
- GRB 171120A: Xinglong-2.16m optical upper limit
- GRB 171120A: Swift/UVOT Upper Limits
- GRB 171120A: AstroSat CZTI detection
- Konus-Wind observation of GRB 171120A
- GRB171120A: GWAC-F60A upper limit
- GRB 171120A: MITSuME Akeno optical upper limits
- GRB 171120A: Swift-BAT refined analysis
- GRB 171120A: Fermi GBM Detection
- GRB 171120A: Swift-XRT refined Analysis
- GRB 171120A: Fermi-LAT detection
- GRB 171120A: Enhanced Swift-XRT position
- GRB 171120A: Swift detection of a burst