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"16 results found.
- GRB 200215A: LCO Optical Upper Limits
- GRB 200215A: CALET Gamma-Ray Burst Monitor detection
- GRB 200215A: RATIR Optical Observations
- GRB 200215A: UKIRT H-band observations
- GRB 200215A: Swift-BAT refined analysis
- GRB 200215A: Swift-XRT refined Analysis
- GRB 200215A: Swift/UVOT Upper Limits
- GRB 200215A: Enhanced Swift-XRT position
- GRB 200215A: Optical observations form Calar Alto 2.2m
- GRB 200215A: Fermi GBM detection
- GRB 200215A: Liverpool Telescope upper limits
- GRB 200215A Possible host galaxy in PanSTARRS
- GRB 200215A: Nanshan/NEXT optical upper limit
- GRB 200215A: Swift detection of a burst
- GRB 200215A: Fermi GBM Final Real-time Localization
- GRB 200115A: Assy optical observations