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"12 results found.
- GRB 150428A: late-time radio observations
- Konus-Wind observation of GRB 150428A
- GRB 150428A: Swift/UVOT Upper Limits
- GRB 150428A: MASTER-net early optical observation
- GRB 150428A: Swift-XRT refined Analysis
- GRB 150428A: Swift-BAT refined analysis
- GRB 150428A: Danish1.56m optical observations
- GRB 150428A: RATIR optical observations
- GRB 150428A: P60 observations
- GRB 150428A: Enhanced Swift-XRT position
- GRB 150428A: GROND Dark Burst Host Candidate
- GRB 150428A: Swift detection of a burst