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.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"15 results found.
- GRB 120219A, the review of the sky area in plate archives
- GRB 1202019A: optical observation in Mondy observatory
- GRB 120219A: MASTER prompt and early optical limit and OT discussion
- GRB 120219A: 1.23m CAHA optical observations
- GCN 12974 : Errata in the Subject
- GRB 120219A, optical observations
- GRB120219A: Keck Observations
- GRB 120215A: MITSuME Akeno Optical upper limits
- GRB 120219A: Swift-XRT refined Analysis
- GRB 120219A: Swift/UVOT Upper Limits
- GRB 120219A: MITSuME Okayama Optical upper limits
- GRB 120219A: Swift-BAT refined analysis
- GRB 120219A: Enhanced Swift-XRT position
- GRB 120219A: MASTER-NET prompt and early optical observations
- GRB 120219A: Swift detection of a burst