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"14 results found.
- GRB 141031B: TShAO optical observations
- GRB 141031B: RATIR Optical and NIR Observation
- GRB 141031B: Swift/UVOT Upper Limits
- GRB 141031B: Swift-XRT refined Analysis
- GRB 141031B: Bassano Bresciano Observatory upper limit
- GRB 141031B: NOT optical observations
- GRB 141031B: MITSuME Ishigakijima upper limits
- GRB 141031B: Swift-BAT refined analysis
- GRB 141031B: Enhanced Swift-XRT position
- GRB 141031B: TShAO optical upper limit
- GRB 141031B: 1.23m CAHA I-band observations
- GRB 141031B: Nanshan optical upper limit
- GRB 141031B: MASTER early optical observations
- GRB 141031B: Swift detection of a burst