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"18 results found.
- GRB 090417B: Optical observation
- GRB 090417B: Swift/UVOT Upper Limits
- GRB 090417B Correction to the BAT refined analysis position
- GRB 090418: Erratum in GCN 9168
- GRB 090418: Optical observations with MITSuME Okayama and Ishigaki 1m telescope
- VLA radio upper limit on GRB 090417B
- GRB 090417B: Gemini imaging
- GRB 090417B: Galaxy redshift
- GRB 090417B: Swift-XRT refined analysis
- GRB 090417B: Swift-BAT further refined analysis
- GRB 090417B: Subaru NIR Observations
- GRB 090417B: Liverpool Telescope observations
- GRB 090417B: MITSuME Okayama optical upper limits
- GRB090417B: Xinglong TNT optical upper limit
- GRB 090417B: optical observations
- GRB090417B: optical observations
- GRB 090417B: Swift-BAT refined analysis
- GRB 090417B: Swift detection of a burst