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"12 results found.
- GRB 111210A: optical upper limit of Mt. Terskol observatory
- GRB 111210A: Xinglong TNT upper limit
- GRB 111210A: GROND observations
- GRB 111210A: SDSS prior imaging
- GRB 111210A: Swift-XRT refined Analysis
- GRB 111210A: MITSuME Okayama Optical upper limits
- GRB 111210A: Gemini-North candidate counterpart
- GRB 111210A: Swift/UVOT Upper Limits
- GRB 111210A: Spectral lag analysis
- GRB 111210A: Enhanced Swift-XRT position
- GRB 111210A: Swift-BAT refined analysis
- GRB 111210A: Swift detection of a burst