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"12 results found.
- GRB 201006A: Chandra upper limit on the X-ray afterglow
- GRB 201006A: GROWTH-India Telescope optical upper limit
- GRB 201006A: Lowell Discovery Telescope upper limits
- GRB 201006A: MITSuME Akeno optical upper limits
- GRB 201006A: Swift-XRT refined Analysis
- GRB 201006A: Swift-BAT refined analysis
- GRB 201006A: Swift/UVOT Upper Limits
- GRB 201006A: Fermi GBM detection
- GRB 201006A is likely a short burst
- GRB 201006A: Enhanced Swift-XRT position
- INTEGRAL sub-threshold detection of GRB 201006A
- GRB 201006A: Swift detection of a burst