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"13 results found.
- GRB 140408A: MAXI/GSC detection
- GRB 140408A: Withdrawal of afterglow candidate
- GRB 140408A: 1.5m OSN optical upper limit
- GRB 140408A: MITSuME Akeno Optical observation
- GRB 140408A: RATIR Optical Upper Limits
- GRB 140408A: Swift-BAT refined analysis
- GRB 140408A: GROND Detection of an Afterglow Candidate
- GRB 140408A: Swift/UVOT Upper Limits
- GRB 140408A: Swift-XRT refined Analysis
- GRB 140408A: MITSuME Okayama upper limits
- GRB 140408A: Enhanced Swift-XRT position
- GRB 140408A: Fermi GBM detection
- GRB 140408A: Swift detection of a burst