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 140614B: MOSFIRE Ks-band nondetection
- GRB 140614B: MITSuME Akeno upper limits
- GRB 140614B: Swift-XRT refined Analysis
- GRB 140614B: MITSuME Okayama upper limits
- GRB 140614B: Swift-BAT refined analysis
- GRB 140614B: Swift/UVOT Upper Limits
- GRB 140614B: RATIR Optical and NIR Observations
- GRB 140614B: Enhanced Swift-XRT position
- GRB 140614B: Swift detection of a burst