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 220527A: A BdHN I with a clear UPE phase
- GRB 220527A: MITSuME Akeno continued optical observation
- GRB 220527A: Lick 3m Optical Observations
- Konus-Wind observation of GRB 220527A
- GRB 220527A: AST3-3 Yaoan Optical Observation
- GRB 220527A: REM optical/NIR observations
- GRB 220527A: VLT/X-shooter spectroscopic redshift
- GRB 220527A: MeerLICHT afterglow observations
- GRB 220527A: NOT optical photometry and spectroscopic redshift
- GRB 220527A: AstroSat CZTI detection
- GRB 220527A: CALET Gamma-Ray Burst Monitor detection
- GRB 220527A: MITSuME Akeno optical observation
- GRB 220527A: Swift/UVOT detection
- GRB 220527A: Swift-XRT afterglow detection
- GRB 220527A: Fermi GBM Observation
- GRB 220527A: Swift ToO observations
- GRB 220527A: Fermi-LAT detection
- GRB 220527A: Fermi GBM Final Localization
- GRB 220527A: AGILE detection