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 141220A: GMG observation limit
- GRB 141220A: MITSuME Akeno upper limits
- Konus-Wind observation of GRB 141220A
- GRB 141220A: Fermi GBM observation
- GRB 141220A: MITSuME Okayama upper limits
- GRB 141220A: Swift-XRT refined Analysis
- GRB 141220A: Swift-BAT refined analysis
- GRB 141220A: Swift/UVOT Detection
- GRB 141220A: Photometry from OSIRIS/GTC
- GRB 141220A: LT optical afterglow observations
- GRB 141220A: Redshift from OSIRIS at the 10.4m GTC
- GRB141220A: 1.23m CAHA I-band observations
- GRB 141220A: Swift detection of a burst with an optical afterglow