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"9 results found.
- GRB 200612A: Fermi GBM detection
- GRB 200612A: Swift/UVOT Upper Limits
- GRB 200612A: Swift-BAT refined analysis
- GRB 200612A: Swift-XRT refined Analysis
- Konus-Wind observation of ultra-long GRB 200612A
- GRB 200612A: Enhanced Swift-XRT position
- GRB 200612A: Late Optical Maximum Deteted by MASTER
- GRB 200612A: BOOTES-3/YA optical upper limit
- GRB 200612A: Swift detection of a burst