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"19 results found.
- GRB 141225A: GMG observation limit
- Christmas GRB 141225A: GROND Observations
- GRB 141225A: MASTER-SAAO OT light curve
- GRB 141225A: MITSuME Okayama upper limits
- GRB 141225A: TAROT Calern observatory optical observations
- GRB 141225A: Swift/UVOT refined analysis
- GRB 141225A: Fermi GBM detection
- GRB 141225A: very early T60 observations
- GRB 141225A: Swift-BAT refined analysis
- GRB 141225A: Swift-XRT refined Analysis
- GRB 141225A: MASTER-SAAO first OT detection
- GRB 141225A: Nanshan very early optical observations
- GRB 141225A: Enhanced Swift-XRT position
- GRB 141225A: Redshift from OSIRIS at the 10.4m GTC
- GRB 141225A: UVOT detection
- GRB 141225A: Optical aftergow confirmation
- GRB 141225A: LT optical candidate
- GRB 141225A: 1.23m CAHA optical observations
- GRB 141225A: Swift detection of a burst