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.
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"
13 results found.
- GRB 170921A: 15 GHz upper limits from AMI
- Correction to GCN Circular 21919: GRB 170921C: Insight-HXMT detection
- GRB 170921A: RATIR Optical Afterglow Detection and NIR Observations
- GRB 170921A: Swift/UVOT Upper Limits
- GRB 170921A: Swift-BAT refined analysis
- GRB 170921A: LCO 2m telescope observations
- GRB 170921A: NOT optical observations
- GRB 170921A: Nanshan optical upper limit
- GRB 170921A: Enhanced Swift-XRT position
- GRB 170921A: MITSuME Okayama upper limits
- GRB 170921A: Swift-XRT refined Analysis
- GRB 170921A: TAROT Calern observatory optical observations
- GRB 170921A: Swift detection of a burst