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 110820A: optical observations in Maidanak observatory
- GRB 110820A: optical upper limit
- GRB 110820A, the review of the sky area in plate archives
- GRB 110820A: MASTER-NET first hour observations
- GRB 110820A: Swift/UVOT Upper Limits
- GRB 110820A: Position udpate + 2nd epoch data
- GRB 110820A: i-band finding chart + correction to 12295
- GRB 110820A: CQUEAN izY Observation
- GRB 110820A: Swift-XRT refined Analysis
- GRB110820A: MITSuME Ishigakijima Optical Upper Limits
- GRB 110820A: Swift-BAT refined analysis
- GRB 110820A: Enhanced Swift-XRT position
- GRB 110820A: CrAO optical upper limit
- GRB 110820A: MASTER-NET observations
- GRB 110820A: Swift detection of a burst