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"13 results found.
- GRB 121108A: optical upper limit
- GRB 121108A: Swift-XRT refined Analysis
- GRB 121108A: Swift/UVOT Upper Limits
- GRB 121108A, Swift-BAT refined analysis
- GRB 121108A: Xinglong TNT upper limit
- GRB 121108A: Enhanced Swift-XRT position
- GRB 121108A : Lulin/TRIPOL2 Optical Limits
- GRB 121108A: Optical observations
- GRB 121108A: MITSuME Ishigakijima upper limits
- GRB 121108A: Weihai observatory optical observations
- GRB 121108A: MASTER early prompt optical limit
- GRB 121108A: TAROT Calern observatory optical observations
- GRB 121108A: Swift detection of a burst