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"15 results found.
- GRB 110921A: optical observations in Maidanak observatory
- GRB 110921A: optical observations
- GRB 110921A: MITSuME-Akeno Optical photometry
- GRB 110921A: Swift/UVOT Observations
- GRB 110921A: NOT observations
- GRB 110921A: Fermi GBM observation
- GRB 110921A: TNT astrometry
- GRB 110921A: Swift-XRT refined Analysis
- GRB 110921A, Swift-BAT refined analysis
- GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
- GRB 110921A: Enhanced Swift-XRT position
- GRB 110921A: MITSuME Akeno Optical Observation
- GRB 110921A : TNT optical counterpart candidate
- GRB 110921A: MASTER-Net early limit
- GRB 110921A: Swift detection of a burst