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"10 results found.
- GRB 160504A: 15 GHz upper limits from AMI
- GRB 160504A: Swift-BAT refined analysis
- GRB 160504A: RATIR Optical and NIR Observations
- GRB 160504A: Swift/UVOT Upper Limits
- GRB 160504A: Bassano Bresciano Observatory upper limits
- GRB 160504A: Swift-XRT refined Analysis
- GRB 160504A: Enhanced Swift-XRT position
- GRB 160504A: NOT upper limits
- GRB 160504A: TAROT Calern observatory optical observations
- GRB 160504A: Swift detection of a burst